This is the most extensive repository about TW Documentation: https://support.ptc.com/appserver/cs/view/solution.jsp?n=CS232833&art_lang=en&posno=1&q=thingworx%20documentation&source…
About your question of me and Things['ThingName']:
- me --> Yes a reference to myself ( on the thing where service it's called )
- Things['ThingName'] --> A reference to the given 'ThingName'
- Things[me.name] --> A reference to myself, mostly equal to me, but there's some edge cases that it's not exactly the same ( for instance if a Restart on the thing was executed while you were executing the Script ).