Linking Two Programs

I'm back again haha(:
I'm fairly new to c++ and I don't know how to link 2 c++ files together. What I have is a c++ file that is a basic password checker and another c++ file that is a guessing game. I want to link the 2 together so that if I enter the correct password in the password program, it automatically opens the guessing game, but if I don't enter the right password it won't. I have the 2 c++ files compiled already and I am using visual c++ 2010. Is there any way to do this?
Thanks!!!(:
P.S,
Sorry for the noobish question haha
Only one of the two cpp files can have a main function. The other cpp file provides functions that can be called. Put both files into your "project" or whatever VS calls it, make sure that each function has been declared before you call it, and then rebuild.
ok thank you I did this but it keeps giving me this error:

error C2447: '{' : missing function header (old-style formal list?)

I have no idea what this means! If you could help me, I would be very grateful.
It means you've screwed up the start of the function. Let's see the code in question.
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