Services menu entry

Is it possible to make a menu entry into the services menu via AppleScript?

I want to start a script from any application to do something with the selected text in the application. The process, from the AppleScript, have to run in the background. Is this possible?

Thanks for your help, hoschy07.

Or has anyone a possibility to access to a applescript from any application.

Thanks for your help.

Use AppleScript Utitility (found in /Applications/AppleScript/) to enable the Script Menu.

Just for reference, this is exactly what can be done with ThisService.