Returns the virtual address (SPTR) of a process's CMGLOBALS record.
cmg (pin)
cmg:sptr (pin:u16)
The process identification number (PIN) for which the address of the CMGLOBALS record is to be returned.
$nmdebug > wl cmg($8) $c4680000
If the PIN does not exist, the function result is undefined and an error status is set.
