Unless the projector is a decade old it will have a RGB 15pin "D-Sub" connector - otherwise known as a common VGA monitor input. Most all projectors will support NTSC, PAL, and SECAM signals via RCA composite input (analog video 'RCA jack') or S-Video.

In other words, there probably isn't a post-1995 laptop or desktop computer that WON'T work with the projector.