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OpenACS/.LRN for Debian

Created by Héctor Romojaro, Stefan Sobernig, last modified by Gustaf Neumann 22 Mar 2019, at 11:14 PM

 

Logo

 

Packages of OpenACS  and .LRN  are now available for Debian GNU/Linux . We hope to facilitate the adoption by novices and the infrastructure deployment by professional users, both running Debian GNU/Linux  and its derivatives. Our packaging activity explicitly targets Debian GNU/Linux  stable , testing and unstable . Important dependencies are co-maintained with the Debian Tcl/Tk Maintainers .

See also OpenACS for Ubuntu.

Getting started

Please, review the section on supported distributions first.  Currently, the core packages (openacs, dotlrn) and their dependencies are included into the official Debian GNU/Linux  repositories.

Install


  1. Run:

    apt-get update

     

  2. (optional) Provide for a PostgreSQL environment: If you don't have a PostgreSQL installation at hand, provide one. You do not need to care about setting up a concrete data base. This is automatically done by the OpenACS and dotlrn post-install instructions. For further PostgreSQL-related set-up issue, see ...
     
    apt-get install postgresql
    
    If you run a remote PostgreSQL instance, remember to allow for access of the PostgreSQL Administrator (postgres) and the openacs/dotlrn user from machine hosting your OpenACS/.LRN installation.
     
  3. Install the core packages and follow the on-screen instructions:
     
    # OpenACS
    apt-get install openacs
    ... or ...
     
    # .LRN
    apt-get install dotlrn   

After Install

  1. (optional) To change IP address and port of the instance, please edit the file:
     
    # OpenACS
    /etc/openacs/openacs.sh
    
    # dotLRN
    /etc/dotlrn/dotlrn.sh
    
    
    
  2. (optional) To control the instance using daemontools, please install the daemontools debian packages and follow the instructions on the file:

     
    # OpenACS
    /usr/share/doc/openacs/README.daemontools
    
    # dotLRN
    /usr/share/doc/dotlrn/README.daemontools
     

To-dos

Next Steps, After Basic Installation (above)

 

People

Active contributors

  • Héctor Romojaro 
  • Stefan Sobernig
  • Avni M. Khatri
  • Carl R. Blesius


Packages status


Packages maintained by Debian Tcl/Tk Maintainers 

 

Packages co-maintained by OCT & Debian Tcl/Tk Maintainers 

 

 

 

Prodding

Please, for getting in contact and reporting issues, consider ...

tDOM

Created by OpenACS community, last modified by Gustaf Neumann 22 Mar 2019, at 11:11 PM

A Tcl-based package, tDOM combines high performance XML data processing with easy and powerful Tcl scripting functionality. tDOM is one of the fastest ways to manipulate XML with a scripting language and uses very little memory. Newer versions of tDOM support JSON.

More info at http://tdom.org (mailing list )

What others say about tDOM

Using tDOM with OpenACS

tdom-programming

Introduction to OpenACS

Created by Rocael Hernández Rizzardini, last modified by Gustaf Neumann 22 Mar 2019, at 11:04 PM

Start Playing With Openacs. 

Before you know it, you will Become an Expert in the basics!

This is a quick guide of the things that you have to know in order to become productive in OpenACS. You have to master certain things before you can advance. A developer has to become an expert in handling and knowing the tools that he uses.

MAYBE, the very first thing to become aware of, is that your installed OpenACS server is self-documenting. Take a look at http://your.server/doc/ and spend some time here; I'd suggest an hour or so just to view the structure and get familiar with what is said where, and how it is said. WHENEVER you ask a question and get an answer, try to seek out the solution you get in the docs and piece it together. This WILL help you to gradually become an expert.

You have to become expert in:
- Emacs
- Tcl
- Linux (for OpenACS installation)
- Searching on OpenACS
- Functions that provides NaviServer
- Use of OpenACS
- Basic API OpenACS

Emacs:
You have to become expert in the text editor that you use for development since is a fundamental piece in your development environment. Not knowing the text editor in used makes it very limited and your work will be very unproductive.


Emacs is an extendable editor (but you can use any editor you want).  Check out the oacs emacs module, pretty cool! en:ide-emacs

Minimal knowledge of Emacs:
 - window management
 - copy/paste
 - DB access from emacs
     - It's actually very simple, you run a shell in emacs and then run the text db client in the shell in emacs. Once inside emacs, <code>M-x shell (enter)</code> will put you in a shell. From there, you can do anything the shell can do, and then if you want you can save everything. So, oracle users can use sqlplus, postgres users can use psql. (watch out... by default emacs will NOT offer to save the buffer before you exit!)
 - file management 
 - searching


Required time to know emacs ( 4 hours aprox).

PLEASE DON'T LET THAT SCARE YOU... you don't actually need to know EVERYTHING about emacs or be an expert in emacs itself. Me, I just know how to move the cursor, type, define a macro (no, really, this is easy too) and get into shell mode. Oh, and I can run (doctor) in the *scratch* buffer.

Tcl

Try searching google for "Tcl for Web Nerds" and/or look for some good, basic tutorials. I think you can learn at your own pace, and still have fun with OpenACS.


Minimal knowledge of Tcl:
- lists and manipulation functions
- strings
- proc/namespaces
- switch
- regular expressions (regexp)
- Everything that is basic to Tcl

 (jiml) I'll suggest you find out how to run tclsh (or, say, psql) from inside emacs (see comment about emacs shell mode, above on this same page).


Required time to know and become used to Tcl (6-12 hours approx).

TCL for web nerds: http://openacs.org/test-doc/tcl-wn

Linux (for OpenACS Installation)

Minimal Knowledge
- user management
- group management
- permission
- compilation
- searching
- environment variables

Searching in OpenACS

Do your searching in OpenACS in different areas:
- forums (use google, example: site:opeancs.org postgres 8.1)
- code (use grep and find):  find /path/name -name "*-oracle.xql" -exec grep whatever {} \; -print
- API doc (use to search procs)

Required Time (4 hours approx)

Debugging in OpenACS

This will help us to identify exactly what is producing an error. For that you have to learn::
- To read the log
- To use the Developer Support

To log everything in your log file, go to config.tcl and set "debug true.

Required Time (4 hours)

Functions of NaviServer

Check all of them ( ns_*)

HOWEVER NOTE that it is MUCH more important to see how these calls are used in OpenACS! (aside from which, it will take you less time to understand a single OpenACS interaction if you just look at one... the notes tutorial has a few; I would suggest that you do that tutorial and actually type everything in rather than cut and paste... then you touch every word)

NaviServer Documentation:
https://naviserver.sourceforge.io/n/toc.html

Required Time (4 hours aprox)

Use of OpenACS

Become expert in using OpenACS as a tool, from the user interface point of view.

Important items:
- Developer administration (Site-Wide-Admin) (4 hours)
- Applications: (4 hours or more)
    - User administration:
        - Understand the roles that exist.
            - Will help a lot if you understand more about .LRN
- Basic API of OpenACS

    - The -most- basic part of openacs is its object system.
       Start to get familiar with the object system by reading
       the definition which starts "create table acs_objects"
       and find out everything you can about how to define your
       own object types, how inheritance works, how to drop your types.
       REMEMBER to drop things in -reverse- order from how you create.
       Learn how acs_object inheritance works.
    - Object and User and permission management
    - DB (a detailed document describing the database access api is on your installed server at http://your.server/doc/db-api.html | a search for all tcl db procs: db_*)
    - ad_conn (provides basic information regarding the browser the request is coming from as well as the user (if any logged in) who is doing the browsing; search at http://your.server/api-doc)
    - Permissions: a permission is a statement of the following form:
         PARTY (from table parties) whose party_id is X has
         PRIVILEGE (from table acs_privileges) whose textual name is Y on
         OBJECT (from table acs_objects) whose object_id is Z

         You can:

             - make such a statement (ex. group-of-my-students has "read" on my-student-forums)

             - ask (in various ways) whether such a statement has been made

         I would suggest for further study, that you:

             - MOST IMPORTANT: try things out!!

             - search google for "permissions tediously explained"

             - also see the "notes" tutorial
 

    - acs_rel is good tool for connecting objects. One application: groups of users (so one acs_rel "connects" one user to a common object, representing the group, ex: if andy, betty, carl, dirk and ed are in groups alpha-beta, there will be five acs_rels, all of them tied to alpha-beta on one side of the rel, and for rel, that rel will have one of the users on the other side of the rel)
    - Site-map (instances and site nodes)

    - another VERY important part of OpenACS that was not listed here before, is the templating system. If you have OpenACS installed, you can view the docs at http://your.server/doc/acs-templating/ and you can see dozens of demonstrations at http://your.server/doc/acs-templating/demo AAANNND if that's not enough, every demo has sample code and you can plug it right in to your page! As you can see, you can show values of Tcl variables, make lists and forms, include other templates and show database results and do all of this and more, looking any way you want.

 

Testing with Selenium

Created by Hamilton Chua, last modified by Gustaf Neumann 22 Mar 2019, at 10:13 PM

Testing with Selenium

Selenium is primarily for feature testing, user interface and acceptance testing.

Recently OpenACS got support for Selenium RC   on CVS HEAD to be released in OpenACS 5.6 sometime in the future.

Forum Posts :

http://openacs.org/forums/message-view?message_id=365992

Command Reference :

Selenium Documentation

Interesting Articles :

Tools :

Selenium Recorder Firefox Extension

Quickstart to Writing Tests:

  This quickstart shows you how to start writing selenium tests with selenium and the selenium recorder (aka selenium-ide).

  1. You need to have the Firefox Browser version 1.5 or higher
  2. Proceed to http://www.openqa.org/selenium-ide/ and click on the link (Firefox Extension) to install the Selenium IDE firefox extension
  3. Restart firefox
  4. Click Tools -> Selenium IDE
  5. The selenium ide window will open
  6. It will start recording your actions in the browser.
  7. You can go ahead and go to a url and click on the links to see how the recorder records your actions.
  8. To disable recording while the recorder window is open, click the "red" button.
  9. Selenium verifies that a test or action is successful by checking the title or text in a webpage
  10. You can verify the title of the current page  by right clicking on the webpage you are currently in and click Append Selenium -> verifyTitle
  11. You can verify the presence of text in a page by highlighting some text and then right click -> Append Selenium Command -> verifyTextPresent

Click here for a video of how to use Selenium IDE.

Selenium IDE allows you to create, save, load and run tests right from firefox without having to install Selenium on the server.

Selenium on the Server

Aside from using the Selenium IDE to test webpages, selenium itself can be installed on the server. This provides a central location for testers and developers to view and execute tests. "Server" here refers to the OpenACS instance where your application is running. If your OpenACS instance is in http://your_openacs_instance, then selenium should be installed in http://your_openacs_instance/selenium

WARNING: We do not recommend installing selenium on the server of a production instance. Only install selenium on a staging or test server. This is because

  • When tests fail, they leave a mess of test data that you will not want on production
  • Selenium is mostly javascript that can run on any browser. While there are currently no reports of exploits on servers running selenium, we do not want and (you should not too) take the risk of having it on a production box where it is possible for a clever hacker to utilize a browser vulnerability to break into your server.

To instal selenium on the server :

  1. Download selenium from http://www.openqa.org/selenium-core/download.action
  2. Choose to download the "Full Release"
  3. After downloading, decompress the file.
  4. You will see a folder selenium-x.x where "x.x" is the version of selenium you downloaded.
  5. Go inside this folder and look for the "selenium" folder.
  6. Copy this "selenium" folder to the openacsroot/www/ directory
  7. Launch a browser and go to http://your_openacs_instance/selenium

At this point, selenium is installed. The page that you see when you visit /selenium is the default selenium page. It lists the tests that come with selenium.

To start using selenium on the server :

  1. Customize the landing page /selenium/index.html
  2. Create Test Suites for each package. A test suite is just a file in selenium/tests that lists a number of tests for a particular feature or section of an application. For instance, TestSuite-News.html would be a file that lists the tests for the News Package.
  3. Upload tests to the /selenium/tests folder.

Guidelines for Creating and Running Tests for OpenACS Packages

Coming Soon .....

Some Limitations :

  • Minor Issue with SSL  : Selenium can't switch properly between http and https pages.
  • File Input type not supported : You can't tell selenium to upload a file. But there is a work around with firefox. Read it here
  • WYSIWYG Editors  : Selenium can't write to some WYSIWYG editors like htmlarea but it seems to work with xinha, you just need to get the textearea element name that xinha uses.

Tips :

Use xpath to find specific html elements

I have  scenario where I want to click ona image field with no id or name attribute so there's no easy way to tell selenium to click it. We can either ask the designer to put an id or name attribute or use xpath. Let's say the image button in question looks like this

 <input type="image" src="images/long-login-btn.gif" width=166 height=15 />

the xpath syntax will be

 //input[@src='http://www.openacs.org/images/long-login-btn.gif']

and you can use this in conjunction with clickAndWait

Use javascript to create dummy values

You can use javascript to generate values like so

  javascript{'test' + (new Date()).getTime()}

and use store to store them to a value for use later in the selenium script.

 

2006 OpenACS/.LRN Fall Conference

Created by Carl Robert Blesius, last modified by Gustaf Neumann 22 Mar 2019, at 10:08 PM

Location 

Boston, Massachusetts, USA

Harvard Conference Center 

Map (includes location, close hotels, and public transportation stops) 

Dates and Schedule

Registration and Fees

  • Registration is open. Please let us know if you need any documents beforehand for visa applications or reimbursement
  • Fees: Main conference fee is $95 (if you can not afford the cost of the conference please let us know - we will have a discounted rate and financial assistance may be available). Please see the registration page for additional details.

Travel

Weather

Average from Weather Underground

Local Airports

Logan International Airport is the airport in Boston. It is the closest airport to the conference center. Logan's airport code is BOS. International flights can land at Logan.

The Manchester Airport in Manchester, New Hampshire, and T.F. Green in Providence, Rhode Island, are airports within about an hour's drive of Boston and Cambridge. Many inexpensive airlines serve Providence and Manchester. It is possible to get from downtown Providence to Boston via commuter rail or bus. Hanscom Field in Bedford, Massachusetts, about 25 minutes away from Boston, has flights to and from Trenton, New Jersey.

Local Train Stations

Amtrak, the major American rail company, serves several stations in the Boston area. South Station is one of the area's major transit hubs. It is also on the Red Line (subway line). Amtrak also arrives at North Station, which is on the Green Line, and Back Bay station on the Orange Line.

Bus Lines and Subway

Lodging

Hotels

Best Western Inn at Longwood (SOLDOUT)
342 Longwood Ave, Boston, MA 02115
(617) 731-4700 or 1-(800)-GOT BEST
$159/night - "PARTNERS HEALTHCARE" rate
(try to reserve before October 16th to ensure availability)
0.5 miles from conference center

Longwood Guest Suites
63 Parker Hill Avenue, Boston, MA 02120
1-800-246-8357
$132/night - 1 person occupancy
1 mile from conference center

Longwood Inn
123 Longwood Ave, Brookline, MA 02446
1-800-754-6835
$119/night standard rate
0.8 miles from conference center

 

 

Looking for Roommates

(please add your name here if you are looking for someone to share a hotel room with) 

Crash Space

 (please add to these lists with a link to your user profile)

 

Crash Space Available:

Crash Space Needed:

Who needs a visa to enter the US?

If you are not a resident of the United States, you may need a visa to enter. If you already have a visa and need to enter the US, make sure it will not expire before you use it to apply for admission (entry) at the port. Citizens of the following 27 countries do not need a visa to enter the US for tourism or business for stays of 90 days or less [1]:

Andorra Iceland Norway
Australia Ireland Portugal
Austria Italy San Marino
Belgium Japan Singapore
Brunei Liechtenstein Slovenia
Denmark Luxembourg Spain
Finland Monaco Sweden
France the Netherlands Switzerland
Germany New Zealand United Kingdom

[1] Providing you meet the visa waiver criteria:

a) You must have a machine-readable passport (this means it should have a line of chevrons (e.g., <<< ) valid for six months past your expected stay in the U.S.

b) Any passport issued after October 26, 2005 must include a digital photo.

c) You must have a ticket going out of the US. I.e. only a one-way ticket into the US is not sufficient.

Information for Canadians

Canadian citizens generally do not need either visa or passport to enter the US. All travelers should bring evidence of their identity (e.g., a government photo-id) and citizenship (e.g., a passport; or a birth or citizenship certificate). Fiancees of US citizens, or spouses of US permanent residents, may need a visa even if they are Canadian citizens — especially if they are coming to the US to await final immigration status. .

Getting a visa

To get a visa, contact the nearest US Embassy, Consulate, or other authorized institute to find out how long the process will take (generally anywhere from 3 to 45 days).

Some guidelines for painless visa processing:

  • Ask us for a letter of invitation.
  • Start applying for a visa early. The basic visa process will not take this long, but you will want time to resubmit the application if necessary, and to buy your tickets after the visa has been granted.
  • Prepare for your visa interview/application. You should have
    1. Your entire travel itinerary, from when you leave your country to when you return

      Note that your travel plans depend upon early approval of the visa application

    2. Your invitation, and printed information about the conference

      If you are getting financial support to attend the conference, make sure you have printed documentation of this as well.

    3. Proof of association with OpenACS and/or .LRN (information about you as a researcher, developer, .LRN user, etc.)
    4. Evidence that you will return home -- that is, of "binding or sufficient" ties to your home country (normally your country of residence). Useful examples include:
      • evidence of family ties in your home country
      • evidence of property ownership
      • evidence/statements of bank accounts
      • an employment contract or letter from an employer demonstrating you have employment beyond the end of your trip
      • evidence of attending school, or a letter from a school official demonstrating you will be a student there beyond the end of your trip

Getting visa help

A letter of invitation alone does not guarantee you will be issued a visa. If you have followed the above steps, and your visa application is rejected, let us know immediately. Immigration officials in Massachusetts will contact your embassy to try to overturn the rejection.

If you cannot afford the cost of visas or related fees, let us know. Financial assistance may be available.

Interest in Attending

Enter your name, and any topics you are interested in here Fall Conference 2006 Interest in Attending

Social Program

Dinner  on November 1st will take place at

Jasper White's Summer Shack
Starts at 8:00PM
50 Dalton Street in the Back Bay, Boston, MA
across from the Sheraton Hotel entrance and the Hynes Auditorium. Upstairs from Kings Bowling Alley.
Closest Subway T Station: Green Line - Hynes Auditorium.

The social program on subsequent days will be informal and will be announced at the event

Sponsors

 

 

 MGH LCS ACSPropel  Solution Grove 
     
     

 

OpenACS compatibility matrix

Created by Joel Aufrecht, last modified by Gustaf Neumann 22 Mar 2019, at 12:10 PM

OpenACS requires, at a minimum, an operating system, database, and web server to work. Many additional programs, such as a build environment, Mail Transport Agent, and source control system, are also needed for a fully effective installation.

Table 2.2. Version Compatibility Matrix

OpenACS Version 3.2.5 4.5 4.6 4.6.1 4.6.2 4.6.3 5.0 5.1 5.2 (core) 5.3 (core) 5.4 (core) 5.5 (core) 5.6 (core) 5.7 (core) 5.8 (core) 5.9.0 (core) 5.9.1 (core) 5.10.0 (core)
AOLserver 3 Yes No
3.3+ad13 Maybe Yes No
3.3oacs1 Maybe Yes No
3.4.4 No
3.4.4oacs1 Maybe Yes No
3.5.5 Maybe Yes No
4.0 Maybe Yes No
4.5 No Yes No
4.5.2 No Yes
NaviServer 4.99.4 - No Maybe Yes
Tcl 8.4 Yes No
8.5.4 - Maybe Yes
8.6.7 - No Maybe Yes
XOTcl 1.6 - Yes No
2.0 - No Yes
PostgreSQL 7.4 No Yes No
8.0 No Maybe Yes Maybe No
8.1 No Yes Maybe No
8.2 No tar: no, CVS: Yes Yes Maybe No
8.3 No Yes Maybe No
8.4 No Yes No
9.0 No Yes Mostly
9.2 No Mostly yes Mostly
9.4 No Mostly yes
11 No CVS: yes Yes
Oracle 8.1.6 Maybe Yes Maybe
8.1.7 Maybe Yes Maybe
9i No Yes Maybe
10g No Yes Maybe
11g No Maybe

The value in the cells correspond to the last version of that release, and not necessarily to all minor releases. Empty cells denote an unknown status.

JSON

Created by Michael Aram, last modified by Michael Aram 20 Mar 2019, at 05:17 PM

Caveat: Page under construction

There are several libraries and ways available to parse and/or generate JSON in OpenACS. 

yajl-tcl

Created by Michael Aram, last modified by Michael Aram 20 Mar 2019, at 05:16 PM

Caveat: Page under construction

yajl-tcl

Example Installation for NaviServer under Ubuntu 

apt-get install libyajl-dev pkg-config
cd /var/tmp
export YAJLTCL_VERSION=1.7.0-rc1
wget --no-check-certificate -O yajl-tcl-${YAJLTCL_VERSION}.tar.gz https://github.com/flightaware/yajl-tcl/archive/v${YAJLTCL_VERSION}.tar.gz
cd /usr/local/src
tar -xzf /var/tmp/yajl-tcl-${YAJLTCL_VERSION}.tar.gz
cd yajl-tcl-${YAJLTCL_VERSION}
autoconf
./configure --enable-threads --with-tcl=/usr/local/ns/lib
make
make install

rl_json

Created by Michael Aram, last modified by Michael Aram 20 Mar 2019, at 05:15 PM

Caveat: Page under construction

rl_json

Example Installation for NaviServer under Ubuntu 

cd /var/tmp
git clone https://github.com/RubyLane/rl_json.git
cd rl_json
./configure --prefix=/usr/local/ns && make && sudo make install

Chat

Created by Emmanuelle Raffenne, last modified by Benjamin Brink 18 Mar 2019, at 10:53 AM

Package Specification Summary for Package: chat

Summary: Server based chat with an html and ajax client.
Description: Adapted by Peter Alberer 2006/03/25 to allow java and ajax to coexist. Adapted by Tekne 2006/03/01 to replace JAVA server with AJAX; make use of generalized chat class from xotcl-core.
Maturity: New Submission or Maturity Unknown
This package depends on: acs-kernel xotcl-core
Packages that depend on chat: chat-includelet chat-portlet dotlrn-chat
Package parameters:
AppletHeight
Height of the applet (default 500, type number, scope instance)
AppletWidth
width of the applet (default 700, type number, scope instance)
DefaultClient
Default client interface to use (default ajax, type string, scope instance)
ServerHost
Chat server host (default , type string, scope instance)
ServerPort
Listening for chat connection on this port (default 8200, type number, scope instance)
UserColors
A list of colors to assign to user names in the chat (default #006400 #0000ff #b8860b #bdb76b #8b0000, type string, scope instance)


Bug Tracker Summary for Package: chat

Open Bugs: 1
Latest Bug Opened: 2006-04-05 Ajax chat English language catalog incomplete
Latest Bug Fixed: 2015-07-25 Russian localization for package chat(HEAD).
Top Bug Submitters: Ryan Gallimore (3) Joel Aufrecht (1) v v (1)
Top Bug Fixers: Gustaf Neumann (4)


Code Metrics Summary for Package: chat

# Tcl Procs 0
# Tcl Lines 0
# Tcl Blank Lines 1
# Tcl Comment Lines 0
# Automated Tests 0
# Stored Procedures PG: 0 ORA: 0
# SQL Lines PG: 0 (blank 1 comments 0) ORA: 0 (blank 1 comments 0)
# ADP pages 0
# ADP lines 0
# Include pages (chat/lib/) 0
# Documentation pages 0
# Documentation lines 0
Browse Source Not installed

 

The chat package is using currently two different chat engines:

  1. The Java applet and the Java chat server, or
  2. the Ajax based chat class from xotcl-core

If no xotcl-core is installed, one can only use the version with Java applet. If xotcl-core is installed, one has to option to choose between both engines via parameter.

In essence, the Ajax based variant is the chat implementation from xowiki plus chat room management and a list of the currently connected users. Originally, the ajax-based chat class (::xo::Chat) was developed for xowiki, but later moved to xotcl-core such that the chat package does not need a dependency on xotcl-core and xowiki.

Actually, the chat support in xowiki contains a different variety of ajax based communication strategies:

  1. Polling mode (the web browser queries via ajax in definable intervals the server, and checks, if there is some new information available), and
  2. Streaming mode (the client opens a connection to the server, the server pushes the information back to the client. xowiki chat supports two different submodes:
    1. streaming of JSON  objects via asynchronous AJAX sockets, or
    2. scripted streaming, where the browser loads HTML with embedded script tags in the background  from an hidden iframe

Both (2a) and (2b) require libthread support and a small patch for the aolserver, so they are currently not for beginners. However, the advantage of the streaming approaches is that they are much faster in the look and feel and that they are better scalable on sites with a high load. 2a works only on firefox (not in current versions of IE or Safari) and has the advantage over 2b that the browser does not show the background activity (no spinning wheel in Firefox). 2b is more robust and works with Safari, IE and Firefox (the information about the browser support is from 2006, and most probably different today). Both streaming modes implement, what is sometimes called COMET .

 

When the chat package uses the ::xo::Chat, it uses it only in currently only polling mode which has the  least requirements. This has been as well tested with (Firefox, IE and Safari).

 

 

 

 

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