C++ Windows Form Application Help

[kgzak]

I am working in C++ to make a program that will keep track of our hours at robotics. The idea is that you would pick you name from a list and click sign in and it would store the time you clicked and then when you left you would click sign out and it would calculate the time you had been there. I was planning on using an array to store the beginning time and another one to store the ending. I do not have that much experience in C++ (took a class last year at our high school) and have absolutely no experience in C++ form applications. I kinda know how to do this in Visual Basic but I thought C++ would be a fun challenge. How would I go about making a global array to use in my functions? I read that I would have to put it in a header file but how would I go about doing that? All help will be appreciated.

edit: I am using Visual Studio 2008. I don't know if that matters at all.