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A processor is a way of licensing Microsoft software on a subscription basis within Zettagrid. A processor license allows an unlimited number users access to the Microsoft software. Processor licenses are usually more expensive than a Subscriber Access License (SAL), however they become cost-effective with increasing number of users. Unlike a SAL which can be used to access more than one instance (or VM) of the software, a processor license has a direct relation to the number of VM?s you have. If you have ONE VM then you need ONE set of processor licenses, if you have TWO VM?s then you must purchases TWO sets of processor license and so on. Zettagrid cap the number of processor licenses per VM at TWO, regardless of the amount of cores or Ghz in your VM. See an explanation of cores vs processors vs Ghz elsewhere in the FAQ.