How is the fullscreen help function invoked?

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How is the fullscreen help function invoked?

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Once REVIEW is installed, just issue FSHELP (or FSH or HEL) instead of HELP. FSHELP supports all the same operands as TSO’s HELP. If FSHELP cannot handle an operand correctly, it simply transfers control to HELP. The XCTL subcommand of FSHELP allows this transfer to be triggered manually.