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If you take a look at the HELP text for the SNDRPY command you see:
Examples for SNDRPY
SNDRPY MSGKEY(&KEY) MSGQ(SMITH) RPY(YES)
This command sends a reply of YES to the message whose reference key is specified by &KEY, which was received at message queue SMITH. Because the reply contains only one word, the reply does not have to
be enclosed in apostrophes.
The MSGKEY value is set when the message is received from the message queue via RCVMSG.
Here is HELP text for the MSGKEY parameter of the RCVMSG command:
Message key (MSGKEY)
Specifies the message reference key of the message that is received.
*NONE
No message reference key is specified.
*TOP
The top of the message queue is used. *TOP can be used only
when *NEXT is specified for the Message type (MSGTYPE)
parameter. It causes the first message on the message queue to
be received. For program message queues, this is the message
following the last request message that was received, if any.
name
Specify the name of the CL variable that contains the message
reference key of the message to be used by this receive
function. The variable must be a character variable having a
length of four characters.
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