free
Free memory in the debuggee (using VirtualFreeEx).

arguments
[arg1]: Address of the memory to free. When not specified, the value at $lastalloc is used.

[arg2] (optional): if exist an arg2 (with any value) the memory map GUI is not updated explicity from this command. 

result
This command sets $result to 1 if VirtualFreeEx succeeded, otherwise it's set to 0. $lastalloc is set to zero when the address specified is equal to $lastalloc.