There are no other files named abbreviation.hlp in the archive.
By abbreviating commands and command arguments, you can further
increase the speed with which you give instructions to TOPS-20. The
smallest unique abbreviation for a command or argument will stand for
the entire word; if there is a default choice for further arguments,
the system will assume you want this too. (You can determine
sufficient abbreviations by using the ESC key: any correctly
recognized abbreviation will stand for the word.) For example, the
abbreviated command FD stands for the FDIRECTORY command; I L stands
for INFORMATION LOGICAL-NAMES JOB.
There are a few cases where non-unique abbreviations stand for a
frequently used command. For example, DIS is the abbreviation for
DISABLE even though two other commands begin with the letters
DIS - DISCARD and DISMOUNT.
Special Abbreviation Command
INFORMATION F INFORMATION FILE-STATUS
LOG (When not logged in) LOGIN
LOG (When logged in) LOGOUT
You cannot use abbreviation (or recognition) in a few cases. The
names of devices (including file structures), and jobnames (given, for
example, as arguments to the MODIFY or CANCEL command) must be typed
in full; and of course passwords cannot be abbreviated or recognized.