AppMon is a Messenger Plus! Live Script that customizes your personal message based on what applications you are running. Traditional programs stops at showing what processes are running, but has little capacity for customization as it doesn't capture the actual application's title bar, but instead only the process name.
To use it, all you need to do is to add in the details in which the script can identify the application you want to capture, and a pair of regular expression (matching pattern and replacement syntax) which the script will apply to and display it on your personal message. You can customize your status when the application is running too.
This is a very trivial example to showcase capturing of applications with title bar that remains static.
By searching and replacing the entire string: ".*" with "I am playing Solitair", your personal message will display that line everytime you start playing solitair.
This will probably be a more useful application of AppMon. Basically, it captures an application with abritary title bar (opened files?).
To get it to start monitoring this application, you have to give it an application name EditPlus. You can then do customization based on the text of the title bar.
Some people have asked me how to capture Internet Explorer windows like "Messenger Plus! Live - The Windows Live Messenger Extension - Windows Internet Explorer". Basically, typing in "Internet Explorer" will work, as with "Messenger Plus! Live". It depends on what you want to capture.