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All &APPC verb options complete by setting a number of NCL variables with return code information.
General completion code information is contained within the &RETCODE system variable, and is qualified by the &ZFDBK system variable. &RETCODE values of 0 and 4 occur in normal operation, while &RETCODE values of 8 or higher indicate an error condition. If an error is detected, the &SYSMSG user variable is set providing an explanation of the error condition.
A number of APPC system variables are available providing information about the current conversation being operated. For example, following a receive operation, the &ZAPPCWR and &ZAPPCWRI (the what-received indicators) provide information about what satisfied the receive.
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