Executing an application from javascript

[ObsidianX]

I need to be able to execute an application from a javascript-controlled application to parse some data for the user. How would i go about doing this? Client trust isn't an issue with this application because the user has to sign-in to load the application in the first place. The application, by the way, is a terminal application that will return data which will be stored into a variable in the javascript. Any help is greatly appreciated.

--ObsidianX