Wait, I figured it out. =)
Stopping a Macro
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Once you have started a macro, you may find times when you need to stop the macro before it is complete. There are several ways to do this.
Aborting a Macro
If you have selected to display the Running icon when a macro is running, right mouse click on the icon in the System tray to stop the macro. Or you may press the Scroll Lock and Pause keys to stop the macro. This is the default hot key. You can change the default to Win + ` or the Pause key by going to Options | Preferences | Playback.
Any of these options will cancel a macro that is playing. However, please note that macros that consist of a lot of keystrokes can send the keystrokes rather quickly and Windows will buffer up the keystrokes. Once such commands have been buffered up in Windows, aborting a macro will not cancel them. In these cases, it may appear that the abort command did not work when in reality the macro has already finished issuing its commands and Windows is now processing them.
Note: The Timed Delay in Seconds command and the Wait for Time to Elapse command suspend Macro Express for the amount of time specified. During this delay time the macro cannot be terminated.
Macro Stop
The Macro Stop command allows you to stop the execution of a macro before the macro steps have completed. You would insert the Macro Stop command into your macro script. Whenever this line in the macro is reached, the macro will terminate. In most cases you would use this command in conjunction with a conditional statement. For example, if a desired condition is not met, terminate the macro.