This check does the following tasks:

try to establish a connection to a WebSphere MQ QueueManager through the "amqscnxc" program (part os WMQ samples). This is a checkscript, which is called inside the "SIMPLE" adapter

An example:
<SIMPLE>
  <!-- check if a connection to a WebSphere MQ Qmgr
       is possible
  <SCRIPT>
    <SCRIPTNAME>/home/osmart/bin/mqconnect -c 127.0.0.1(1415) -q qmgr1</SCRIPTNAME>
    <CHECKNAME>MQConnect</CHECKNAME>
    <CHECKPOINTNAME>qmgr1</CHECKPOINTNAME>
    <ERRORLEVEL>WARNING</ERRORLEVEL>
  </SCRIPT> -->
</SIMPLE>
        

To get a closer view, how the SIMPLE-Adapter works, look at Section 9.42, “Configuration for the simple check”