The QMC (or sometimes called QEMC) is the QlikView Management Console (or QlikView Enterprise Management Console). It is a web page hosted on your QlikView server which allows you control over your QlikView deployment. It is accessed by going to this address...
http://[insert your QlikView server name in here without squared brackets]:4780/QMC/default.htm
This will give you access to perform automatic reloads etc.
This is run by one of the 5 QlikView services running on a QlikView server, through port 4780 as default.
Here is a helpful link to get you started...