Well, this is pretty easy. However if you do this, you won't have a dock icon nor the menu option when you click on the program. only whats built into the UI.
Go into "Applications" and right click on the application in particular and hit "show contents". In the "contents" folder, theirs a file called "Info.plist". Open it with Text Edit.
Add the following to the file:
make sure your adding this before a <key> call or after the </string> call, if you add this between another set of key/strings it will break it and won't open the app, (and the icon for the info.plist file won't be the same as it was before your edit..)
Remember: NO DOCK ICON OR MENU .. so only do this if you have a program you don't mind not having those, (like i have istat running all the time on my second monitor.. sooo somethin like that..)