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Recognition

"Recognition" input is another feature of the TOPS-20 operating system
that  speeds  up  your  input, by finishing the typing of a command or
command argument for you when you have given only part of it and  then
prompting your next response.

As soon as  you  have  typed  enough  of  a  command  or  argument  to
distinguish it from others, press the ESC key:  the system will finish
the word, if possible, and prompt  your  next  input  with  guidewords
enclosed in parentheses.  By pressing the ESC key without beginning an
argument you make the system print the default argument, if  there  is
one.  If the system cannot help you, either because you have not typed
enough characters to make your intentions clear or because there is no
default,  your  terminal makes a warning noise - either a ringing bell
or high-pitched beep.

Because the ESC key does not produce a printed character, you  may  be
unable  to  remember exactly where you pressed it when later examining
the output from a hard-copy terminal.   If  you  want  to  avoid  this
possibility,  use  the TERMINAL NO RAISE command to make your terminal
produce lowercase input, to distinguish it from the uppercase printing
of the system.

For TOPS-20 Version 7, recognition has been expanded so that presssing
the  ESC  key  also  shows  as  much  of  a  command  keyword  or file
specification as possible.  For file specifications, recognition is in
effect only for the file name, extension, and version.

You cannot  use  recognition  for  device  names  or  directory  names
(including file structures), jobnames (for example, with the MODIFY or
CANCEL command) or logical names.