Was reading the tutorial about Switching the TV on and off but cannot find it in the app (windows).

Could you specify what you mean by app so I can possibly help you better.

Make sure you tick the box that says switchable under the features tab for the object you want switched on/off. Is this what you mean?

over the versions, quest has added many Tabs in the GUI~Editor... too many, as they were cluttering it up too much, so now they're toggle'able, so if you don't see such a feature/Tab, you got to toggle it on:

http://docs.textadventures.co.uk/quest/upgrade_notes.html

very useful link, btw

app = application (be it an "app" downloaded onto your mobile device or software downloaded/bought/installed onto your computer, etc), so karinchan999 is refering to the quest software/engine for the desktop/offline ("windows").

Thank you XanMag, that helped a lot!
Sorry for not being specific onimike.
Thank you hegemonkhan!