acs_message_p       Check if an integer is a valid OpenACS message id. 
acs_messaging_first_ancestor       Takes the message_id of an acs_message and returns the message_id of the first ancestor message (i.e. 
acs_messaging_send_query       Given an SQL query returning columns recipient_id, grouping_id, and wait_until, arrange for all to be sent for this message. 
ad_page_contract_filter_proc_acs_message_id       Checks whether the value (assumed to be an integer) is the id of an already-existing OpenACS message. 

Package Documentation