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run time libraries

I am a beginner in Visual C++.

I am trying to execute a MS DOS program, because I need to generate a fast signal (80 microseg.) through LPT.
I think I need to use runtime libraries.
Anyway, I am not able to link my program with any options.

I hope one of you could help me.

Resumming,
I need to do "inp", disabling windows.

Thanks in advance.
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Thanks for your help.
Do you know if I can "stop" windows and execute my DOS program, inside
my visual c++ rutine?
What do you mean by "stop"?

In windows 95, you can shut down windows and restart in MS-DOS mode.  This option appears when you try to shut down windows.  You cannot do that from NT however.  However, the program you are creating won't run in DOS mode.  It is not a DOS program, it is a windows program.  VC cannot create DOS programs, only windows programs.