Scripting - Field and Form rules

Scripting - Field and Form rules

I would like to create an auto-complete field that allows the requestor to choose from a list of users in the database.

I have already got the look-up working for an autocompleter on the email field that uses the following:
var emailCCAutoCompleter =new Ajax.Autocompleter(additionalFieldID, 'email_list', '/servlet/AJaxServlet?action=searchMailId', {paramName : 'ccAddress',tokens: [',',';','\n']});

What I think I am looking for is  an equivalent action that allows a search of user names, and what the parameter(s) would be. 

I would also like documentation of what the full list of actions offered by AjaxServlet. 

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