Beam is a 2 player only game based on the light cycles sequence from Tron. Basically, you both control lines that can not stop moving, and can only go in four directions, and you have to box the other person in (or cause them to hit the edge of the screen) to blow them up.
This program was one of the programs included with Computerware's BASIC COMPILER 2.0. It was one of the sample programs that would NOT run under regular Extended BASIC as it used some special features of the the compiler (some other programs included did run both from BASIC and compiled BASIC, which let you see the speed difference). I assume that this example game was written by the same author as the compiler itself.
Title: Beam
Author: Warren Ulrich III (?)
Publisher: Computerware
Released: 1984
Requires: Color Computer 1,2,3, 16K RAM, tape or disk.
If you have any further information on this game, please email me with details.