1 OBSOLETE
  These are command are left from a previous stand-alone
  program and not part of SDA.

2 CLS
  Erases the display and sets the cursor to the top of the display.

  Format

     USB CLS

2 EXIT
  This command does nothing. 

  Format

     USB EXIT

2 EXAMINE
  This command does nothing.

  Format

     USB EXAMINE 881bd450

2 SPAWN
  Spawns a new subprocess.

  Format

     USB SPAWN