weezam: Hello. Nice to meet you.
If you keep your thoughts in your head, even after you've syphoned them off into a Penseive, why would Snape do it before Harry threatened to break into Snape's head in the Occulency classes? Gotta assume that Snape had borrowed Dumb's Penseive to put in storage thoughts and memories he didn't want harry to see yeah?

Though, maybe, Snape was putting thoughts in storage for something that had nothing to do with Harry... naaaa! What doesn't have to do with our Harry!!???

The fact that Harry pierced through Snape's Occulemency defences (got into the yucky childhood abuse memories) even though Voldemort hasn't been been able to crack Snape's defences, that we know, seems to hint to this Occulemency and Legimency stuff being V.V. important later.
What do you think????

Unfortunately, occulemency and Legilimency don't seem to require a wand - that I've seen ...??? - so they aren't exactly the Order Members' communication devices that this thingos meant to be abpout... oh well! Ta for replies anyway. What else can we think of????................ hmmmmmm????