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USGSHELL is a simple shell for Usgard which looks/works exactly like ZShell.
This short documentation will cover both USGSHELL and USGDSIMP since they
have most stuff in common.

When you stard the shell, it will make itself the standard shell. If you
have USGSHELL as standard, and want to make USGDSIMP as the standard shell,
you simple put both shells on the calc, start Usgard (which will then start
USGSHELL), run USGDSIMP, exit it, and exit again. Now USGDSIMP will be the
default shell.

In the shell, the following keys can be used

 UP/DOWN   move cursor
 MORE      show next page of programs (if any)
 ENTER     run the program
 ALPHA     shutdown
 PRGM      show TSR and other appended programs (USGSHELL only)
 EXIT      exit the shell

USGSHELL will also show in the top right corner if you run the LITE or
STANDARD version of Usgard.

If you run USGSHELL and press PRGM, a list of all programs that have appeneded
themselves to Usgard will be shown (most often only TSR programs). The program
at the top of the list is the most recent program. This can be good to know,
since you can only uninstall the LAST installed program. If you have lost
the original file of a TSR, then you can uninstall it, and thus not uninstall
previously installed programs either. In USGSHELL however, you can press the
CLEAR key to remove ALL installed programs, which saves you from the dilemma.

Both shells supports APD of course.
