I assume from your scenario that your VB application is running on a Windows client: Windows98, Windows2000 or Windows NT workstation.
I'm sorry I don't do VB programming. I do LotusScript (a VB like language) and Java. In both those languages, I have access easily through standard API's to the client URL with its hostname or IP address. LotusScript also has direct access to Windows environment variables such as the local COMPUTERNAME.
IF you don't have an equivalent function (which I have to believe VB would provide such access), you can do one of 2 things:
1. Use OLE automation to access a Windows class that can provide access to the local COMPUTERNAME or IP address.
2. Execute a simple BAT command to run an appropriate function like:
ipconfig > myipaddress.txt, then read & parse the generated file, to get the local IP.
Sorry I didn't have a VB specific example.
This was first published in April 2001