WINDOWS
Center alerts on screen
In ResEdit. The computer has to have System 7 or higher to center them. Open up the ALRT editor in ResEdit (but not the item editor that you place the actual items on it with):
1. From the ALRT menu choose "Auto Position..."
2. Two popups will appear. Choose a position (obvious example: "Center"), and then choose a monitor (example: "Main Screen")
Matt