Hi all. The last time I connected my MBP to a monitor/projector, I had it on mirroring. Now, I want to turn off the mirroring, but I don't think I can get access to an external in the meantime? Of course it's not that big a deal if I can't, but is there any way? Thanks. By the way - My MacBook Pro is the Penryn one, if that makes a difference.