Verifies whether a Message enqueuer reference is equal to Not a Refnum. Unlike the Not a Number/Path/Refnum? function, this function does not check whether a non-zero reference still is valid.
Message enqueuer to check.
Boolean value that represents whether message enqueuer is equal to Not a Refnum.
|True||message enqueuer is equal to Not a Refnum. Do not attempt to use this reference to send a Message.|
|False||message enqueuer is not equal to Not a Refnum. This includes when message enqueuer is a non-zero refnum that has been released already. Send the Message and check for an error on that operation.|
Where This Node Can Run:
Desktop OS: Windows
FPGA: Not supported
Web Server: Not supported in VIs that run in a web application