Program interaction

I have created to program that work independently of each other.. but i want the one program to be able to interact with the other, i have heard that this could be done using WM messages but is there any better way and how is this done.

Example: if i click one button in the one program i want the other program to go on top and add some thing to a list and then print some text.

Does someone have a suggestion and know how to do this ?
mSchmidtAsked:
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vinnyd79Commented:
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