Okay, this is what I got out of what I learned:

LD RP, #00H ; Bank 0, working register group 0

This, I believe, makes the register pointer point to a group of 16 bytes. So, now I can access each register by using:

R0
R1
R2
...
R13
R14
R15

Until I specify the Register Pointer (RP) to point to another working register group, R0-R15 are those 16 registers of the working register group.

Thanks!

Cheers,
Sebastian