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HX                                                        CMS Immediate command

Use the HX (Halt execution) Immediate command to stop the execution of any CMS
or CMS/DOS command or program, close any open files or I/O devices, and return
to the CMS command environment.  The format of the HX command is:
+----------+------------------------------------------------------------------+
| HX       |                                                                  |
+----------+------------------------------------------------------------------+

You can issue an Immediate command only after causing an attention interrupt by
pressing the Attention key (or its equivalent).  The command is processed as
soon as it is entered.  It is also executed immediately when stacked in an EXEC
procedure.  Any program execution in progress is suspended until the Immediate
command is processed.


Usage notes:

1.  HX clears all file definitions made via the FILEDEF or DLBL commands,
    including those entered with the PERM option.

2.  The HX command is executed when the next SVC or I/O interruption occurs:
    therefore a delay may occur between keying HX and the return to CMS.  All
    terminal output generated before HX is processed is displayed before the
    command is executed.