For the longest time ive wondered about what i used to call the Dream World

Then I-doser comes along, and i see Lucid Dreaming, i read what its about, and it says bassicly " You have complete control over what happens in ur dreams"

and now that ive found it, to think that i was crazy, all this time its just been lucid dreaming, soo i have LOTS of questions but for now i only have 2...

1: Is it possible to do anything in a lucid dream, then then maybe even later on come back to it, almost as if playing a video game, saving your point in the game and comming back to it.. Is that possible with LD?

2: is it possible to enter a LD with a friend?... like say i wanted to enter a LD with a friend, and we could actulli hang out and stuff in they dream, and then come back to the reality and actuly see that we both experinced the same thing?