Free memory (%) variable - for what kind of memory?

Free memory (%) variable - for what kind of memory?

Hello, support team!
Now we playing with Hardware resources variables of SYSDRV driver.
Free memory (KB) value is equal with windows task manager physical memory available value in MB - we have not any question about it.
Free memory (%) is much greather then 100% - task manager physical memory available value in %.
So question is - what value shows this variable (Free memory (%))? Does it include virtual memory available?

This is a migrated post! Originally posted on 03.06.2013 by user stolyarov_as. Please be aware that information can be outdated.