Passing a type in a function.

I want to call a function which saves all of the information in my type to a file. Since there are 50 instances of this type, I want to call it 50 times. I don't need a return value. How do I just say Callmyfunction() and pass the type to the function? If I just leave it empty, the function has no idea what the type/instance is. I assume I could make my type global, but is there a way to just tell the function?

Sorry if I'm using the wrong words here, types STILL confuse me :)