Question: How do I the find the UserName for a user who is logged into SalesLogix?  I would like to have this so that I can insert it into a record once a user's action is saved on a form.

Answer: This is how you can get the users full name:

select username from userinfo where userid = 'TheUserID'

If you wan the uses login name you will use this:

select usercode from usersecurity where userid = 'TheUserID'