HP NonStop Pathway/iTS Programming Manual page 425

TCP Event Messages
ZPWY-TKN-INSTRUCTION, ZPWY-TKN-PUNAME, ZPWY-TKN-PUOFFSET,
ZPWY-TKN-PUVERSION, and ZPWY-TKN-TCLPROGFNAME
are conditional tokens specific to this event message. See the TS/MP
Management Programming Manual for descriptions of these tokens.
Effect. The SEND operation to the server class fails.
Recovery. Redefine the value of the ZMAXSERVERCLASSES field or reattempt the
SEND operation when a request in progress completes.
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