/DEBUG

 /DEBUG[=debug-file]
 /NODEBUG            (default)

 Determines whether you run a TPU debug file to test procedures for
 an application you are creating.  TPU compiles, and executes the
 debug file---before executing TPU$INIT_PROCEDURE.

 Using /DEBUG without specifying a debug file runs the default TPU
 debugger---TPU$DEBUG.TPU, which provides commands to manipulate
 variables and to control program execution.  To start editing the
 code in the file you are debugging, use the GO command.  For more
 information about the debugger, read the comments in the
 TPU$DEBUG.TPU source file in SYSSHARE, or see the VSI Text Processing
 Utility Reference Manual or use the online help in EVE as follows:

    Command:  HELP TPU Debugger

 There are two ways to specify a debug file of your own:

 o  Define the TPU$DEBUG logical name to specify the debug file, and
    then use EDIT/TPU/DEBUG.

    Defining the logical name does NOT by itself run the debugger when
    you invoke TPU.  It only specifies which debug file is run when
    you use /DEBUG.  You can put the definition in your LOGIN.COM
    file.

 o  Use /DEBUG= and specify the debug file on the command line.

    For example, the following command edits a file named MYPROCS.TPU,
    using a debug file named MYDEBUG.TPU:

       $ EDIT/TPU myprocs.tpu /DEBUG=mydebug

 TPU assumes the debug file is in SYSSHARE.  If your debug file is
 stored elsewhere, specify the device (disk) and directory of that
 file.  You cannot use wildcards to specify the debug file.  You can
 use only one debug file at a time.  Default file type is .TPU.