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 TRAPDBUG is a CLIST which will call any CLIST you select and capture all the
 messages returned by that CLIST into a file.  You are then taken into an edit
 of the file.  You may pass parameters to the CLIST as well when requesting
 execution of a given CLIST.  Simply type TSO TRAPDBUG on an ISPF command line
 and press ENTER.  An ISPF panel will be presented which will allow you to enter
 the CLIST name and any parameters to pass.  Note : If the CLIST uses the
 DGBSWTCH ISPF variable for debug processing, it will be automatically set to
 "ON".  Otherwise, you may pass any necessary parameters to turn on CLIST
 messages.  Nested CLISTs will not be trapped if invoked via ISPEXEC SELECT.
 You must use TSO invocation.