Reading from a program

I was wondering if there was a way to transfer information from one program to another.

I know I could do it with File i/o, but I was wondering if there was another better way to do this. Im not even sure what to search for so if someone would just throw a phrase my way ;)

--Thanks

I don't know of any way easier than file IO. In fact, I can't think of anything other than file IO (with the exception of having one program connect to the other using sockets).