Description

   This routine takes the command string specified and passes it to
   the editor. TPU uses the information from this command string
   for initialization purposes, just as though you had entered the
   command at the DCL level.

   Using the simplified callable interface does not set TPU$CLOSE_
   SECTION. This feature lets you make multiple calls to TPU$TPU
   without requiring you to open and close the section file on each
   call.

   If your application parses information that is not related to the
   operation of TPU, make sure the application obtains and uses
   all non-TPU parse information before the application calls
   TPU$TPU. This is because TPU$TPU destroys all parse information
   obtained and stored before TPU$TPU was called.