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Sends a message to a session-based Subfile Program Message Queue. This API is utilized in conjunction with setting the sflMsgQueueType configuration option to "pjs session" and the msgFileType configuration option to "json".

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1. Message File - the name of the JSON-based session message file; if not qualified, the pathlist is used to find the .json message file
2. Message Id ID - the ID of the message to retrieve from the message file
3. Message Replacement Data (optional) - data field or a data structure that contains all the replacement values required by the message; the length and format of the field depend on the  substitution variables described in the message; for example, for a message with 2 substitution variables defined as *CHAR 10 and *CHAR 5, the replacement data should be a 15 byte field
4. Program Message Queue (optional) - the name of a message queue; if not specified, the current program name is used

pjs.sendMessage('MYMSGF.json', 'ERR9999', msgdata);