What is the difference between push, pull, shift and slide?

[CleverNickName]

I can't decide if I want to make a squaredancing joke here, or a reference to ballet instead...

"Grab your partner, dosie-do, to the ledge and down you go..." Meh.

But seriously, the verbage had me confused as well. I'm looking forward to reading the actual write-up about manuvering and movement. The anticipation is killing me.