Pass parameters to another application

In ApplescriptObjC/Xcode I am trying to pass a parameter/variable from one app to another, have managed to work out how to call another app but not how to pass. Also, how to accept a parameter in the receiving app. Any guidance gratefully received.

    set appName to item i of menuList -- extract app name
    current application's NSWorkspace's sharedWorkspace's launchApplication_(appName) -- launch selected app
    tell application appName to activate -- activate selected app
    tell current application's NSApp to terminate_(me) -- terminate this app