Well I haven't done this myself but I notice a
field_select proc in tclwebtest docs. It's also used in the new tclwebtest automated install that will release with a later version of OACS. It looks like it lets you set a checkbox via its index (position) in the form. You could look at the example use in OACS code if you get the cvs HEAD of OACS and look in
etc/install. Course it's supposed to be a
private proc, so likely not the "right way" to do it;)
