PERL:controlling serial ports ?

Is it possible to write a perl program to controll the serial port?
e.g. What iam trying to do, for a challenge is create a box with two lights. red and green, connect to a serial port and have a perl program to give me the options to turn on the red light or green light.

Is this possilbe, can someone give me a resource on doing this, a good website or book?

Thanks.

UNIX serial port resources at stokely.com may be what you are looking for...