You can easily do digital control with it's legacy parallel port. Lighting led's is a cinch. Controlling rocket launchers is another benefit. Need to do analog input? With a few discrete parts you can even get analog values too. Say grabbing the temperature. If the vga port is new enough, you can even use I2C
Extra cable and interfacing not included but can be built with off the shelf parts.
also see (http://www.instructables.com/id/Mini-parallel-port-break-out-cable/)