Winpopup. How it works?

Could somebody give a proposal how Winpopup utility in Windows 95 sends and receives messages through the Windows NT network.
Which Windows resources and Win32 API functions are used?
How it searches the computer by user name and defines that this user is currently online.
Are there any alternative effective ways for the same purpose?
Who is Participating?
BlackManConnect With a Mentor Commented:
If you go to Martin Djernæs' web-site, you'll find a complete description of how WinPopup is working and on top of that, a Delphi component with full source to sen/receive messages...
What do you want to achieve...
Oops, forgot the URL, sorry....
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