question about branching/returning

[Dave Storrs]

I'm working on documenting the opcodes, and I want to make sure that I
understand the 'RETURN' code properly.  I've poked around a little bit to
see if I coudl figure it out, but I don't want to divert too much.  Would
someone please explain to me what each of the following does?

RETURN 4
RETURN 0
RETURN -2       # Is this even legal?


Thanks in advance,

Dave