# System Parameters

'MX' | User-Defined Message Box

## Description

Allows use of a customizable message box (msgbox.gui) instead of the standard message box Windows API.

#### Note:
When 'MX' is set, MSGBOX commands entered in console mode or executed within an EXECUTE command cannot be followed by any other command (as MSGBOX will be executing a CALL without a return address).

## Default

On (if *ext/msgbox.gui exists)
Off (if *ext/msgbox.gui does not exist)

## See Also

MSGBOX Display Popup Message Box