/sys$common/syshlp/helplib.hlb LSEDIT, Command Qualifiers, /DEBUG  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  /DEBUG[=debug-filespec]
  /NODEBUG (D)

  Determines whether you run a TPU debugger.  This is useful  in  testing
  TPU  procedures  for  an  application  you  are  creating.   LSE reads,
  compiles,  and  executes   the   debug   file   --   before   executing
  TPU$INIT_PROCEDURE.

  The default debug file specification is  SYS$SHARE:LSE$DEBUG.TPU.   You
  can  override  this default on the command line to specify a debug file
  of your own.  For example, the following command invokes LSE,  using  a
  debug file called SYS$SHARE:MYDEBUG.TPU:

      $ LSEDIT/DEBUG=mydebug

  You can define the logical name LSE$DEBUG to specify a  debug  file  of
  your  own.   This  is  useful  if  you want to keep the debug file in a
  directory other than SYS$SHARE.  You cannot use wildcards in the  debug
  file specification.

  The TPU debugger provides commands to manipulate variables and  control
  program  execution.   To  start  editing  the  code in the file you are
  debugging, use the debugger command GO.  For more information about the
  TPU  debugger,  read  the  comments  in  the  source file in SYS$SHARE:
  LSE$DEBUG.TPU or see the Text Processing Utility Manual.