Rajitha - Thanks for your input. I looked into the method you mentioned above and it appears it is only a function available in InfoPath 2007 - a problem since we are running 2003.
Shiva - This method looks promising, however, when I try to set up the Data Connection using 'GetUserCollection' I am prompted for a sample value under 'ns1:userLoginNamesXml'. Is there any way to avoid having to define a sample value? What does this sample value accomplish? From trying to use this connection with a sample value in place, it seems to only see and find that sample value in the connection.
I really appreciate both of you guys' help! Let me know what you think can be done!