[opt]
If nonzero, this string should specify the name of a physical attribute of which a previous value has been stored using
SetPhysical in PHYS_StackTemporary-mode. The specified physical is reset to its previous value and the previous value is removed from the temporary physical stack. If the stack is empty - i.e., ResetPhysical has been called for all respective calls to
SetPhysical in PHYS_StackTemporary-mode, the temporary physicals will automatically be reset. If this parameter is zero, all temporary physicals are reset and any temporary physical values deleted form the stack. See
SetPhysical for an example using this parameter. Since CR.
