Control in a background application with Applescript

Question

Hello, in this example below works, it opens the Skype app and type "email" and wait 20s for the next order, however I would like it to do so without opening the app, without the part of "Active" run in the background:

tell application "System Events"
    delay 3
    repeat
        tell application "Skype"
            activate
        end tell
        delay 0.3
        keystroke "email"
        delay 20
    end repeat
end tell

it is possible?