This has probably been asked a thousand times, but I don't know how to search for this being "what is the m variable" results in the query "what variable" being used.
I looked all over the docs and there's tons of stuff talking about putting/accessing globals on the m variable, but I haven't seen anything that says what it even is and what its own scope is, or why examples do stuff like:
m.myLabel = m.top.findNode("myLabel")
myLabel = m.top.findNode("myLabel")
Can someone explain or point me to the docs about what it is?