By that I mean: How do I find out the name of the computer I'm logged in on using the EPDM API?

I'm setting up code to test whether a file is available for the currently logged in user to edit.  I need to do these tests:

Is the file checked in or out?

If checked out, is it checked out by this user?

If checked out by this user, is it checked out on this machine?

I can do the first two, and I can get the computer name of the machine where the file was checked out, but how do I get the name of the computer where the user is currently working?  I can't find anything about it in the EPDM API help file.

Thx.