Immediate Commands Use the HT command to suppress all terminal output generated by any C"S command or your program that is currently executing. The format of the H'!' command is:
r---- --------.--------------.-------------------------.---------, I HT '--- 1 • Program execution continues. When the
normal terminal output resumes. Use typing or displaying. , ready message is displayed,
the RT command to restore
2. CMS error messages having a suffix letter of S or T cannot be
suppressed. Use the HX command to stop the execution of any C"S or CMS/DOS command
or program, close any open files or I/O devices, and return to the C"S command environment. The format of the HX command is: r---- , HX L- -l i. HX clears all file definitions made via tne FILEDEF or DLBL
commands, including those entered with the PER" option.
2. The HX command is executed when the next SVC or 110 interruption
occurs: therefore a delay may occur between keying HX and the
return to C"S. All terminal output generated before HI is
processed is displayed before the command is executed.
3. HX does not clear user storage. EQ Use the RO command, during the execution of a command or one of your
programs, to resume the recording of trace information that was
temporarily suspended by the SO command. Program execution continues to
its normal completion, and all recorded trace information is spooled to
the printer. The format of the RO command is: r --------------------------------------------------------, , RO , L- 21U IBM CMS Command and Macro Reference

Immediate Commands Use the RT command to restore terminal output from an executing eMS command or one of your programs that was previously suppressed by the HT command. The format of the RT command is: r- I RT L- Program execution continues, and displaying continues from the current
point of execution in the program. Any terminal output that is
generated after the HT command is issued and up to the time the RT
command is issued is lost. Execution continues to normal program
completion. 2Q Use the SO command during the execution of a command or one of your
programs to temporarily suspend the recording of trace information. Program execution continues to its normal completion and all recorded
trace information is spooled to the printer. The format of the SO command is: r 1 I SO , L
To resume tracing, issue the RO command.
Section 2. CMS Commands 215