These two instructions define a message that is written to the system operator.
>>-DFHCLT--TYPE=WTO--,WTOL=addr--addr--WTO----------------------> >--'message to operator'--+-------------------+-----------------> '-,ROUTCDE=(number)-' >--+----------------+--,MF=L----------------------------------->< '-,DESC=(number)-'
The MF (macro format), ROUTCDE (routing code), and DESC (descriptor) operands of the WTO macro are described in the z/OS MVS Programming: Authorized Assembler Services Reference ALE-DYN manual.
DFHCLT TYPE=WTO,
WTOL=wtoad
wtoad WTO 'switch local terminals, please',
MF=L