Variables
This program supports variables. There are three types of variables:

USER: Variables created by the user using the "var" command. These variables have no access restrictions.

SYSTEM: Variables created by the system, that can be read and written, but cannot be deleted.

READONLY: Variables created by the system, that can be read, but not written or deleted.

Reserved Variables
There are a few reserved variables:

$res/$result: General result variable.
$resN/$resultN: Optional other result variables (N= 1-4).
$pid: Project ID of the debugged executable.
$hp/$hProcess: Debugged executable handle.
$lastalloc: Last result of the 'alloc' command.