How can I control instrument using its RS232 port in VB or VC++?

1)How can I control instrument using its RS232 port in VB or VC++?
2)What's the module or .h file need I add-in to VB or VC++?
3)Can you provide me some easy examples for that?
Thanks!

Kevin,
I've used Measurement Studio - Tools for Visual Basic and Tools for Visual C++ (ActiveX component) for instrument control.
I've used both the VISA and non VISA versions and they are pretty straight forward to use for GPIB, Serial or VXI.
You might find the following page useful.
http://www.ni.com/mstudio/cworks.htm#ICC
Regards,
Kamran

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