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LOGFILE

 If a filename or unit  number is given, open that  file as a log  file.
 If neither is given, close the  currently open log file.  The log  file
 will contain a copy of each input line subsequently entered until it is
 closed.  This may be useful  in interactively developing graphs,  since
 mistakes can simply be  redrawn, and then later  edited out of the  log
 file.  Logging is temporarily suppressed while input is being read from
 a file which is not the original input file, in order to avoid  copying
 the contents of INCLUDE files.   The LOGFILE command is therefore  made
 illegal inside INCLUDE files and will be ignored if found.

 If the operating system supports it, you can request command completion
 in  the  filename  by  terminating  it  with  the  recognition  editing
 character (ESCape on a DEC-20).   Partial field recognition (CTL-F)  is
 not yet supported.