Returns the current send map name.
If data mapping is supported by an LU6.2 connection, an APPC conversation can specify a map name with each issuance of &APPC SEND_DATA. This map name is used by the receiving system to interpret the contents of the data transmitted. The system variable &ZAPPCSM is set to the map name sent by the last SEND_DATA operation.
Example: &ZAPPCSM
&WRITE DATA=DATA SENT USING MAP NAME: &ZAPPCSM
Note: When sending NCL tokens, a map name of $NCL is sent with the data by default, to indicate that the data comprises one or more NCL tokens.
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