To get the RAF bonuses:
a) Accounts need to be DIRECTLY raf linked to each other;
b) Characters need to be grouped;
c) Characters need to be within +/- 4 levels of each other;
d) Characters need to be within a certain proximity of each other;
e) Mobs killed or Quests turned in, cannot be greyed out to either character;
f) Both characters need to be 79th or lower level.



If you have a chain like this:
A > B > C
A > D > E

And on 'A' you have a level 85 or 90 booster.
Obviously the A > B and A > D chains won't work for RAF, because the lower characters on BCDE are between 1st and 80th.
Still, the B > C and D > E chains both can easily meet the requirements for RAF.
Meaning, A (85th) can boost BCDE (22nd to 35th) in Scarlet Monastery, provided B>C and D>E meet the above requirements for RAF.



If your team of BCDE are all level 22, and you go into Scarlet Monastery...
In the actual instances, with elite bad guys...
You might get 1,000 experience (per toon) for each mob you kill.
And four mobs might be your absolute maximum, which could take 2 minutes to kill, and then 2 minutes to recover health/mana, etc.
If you added a fifth mob, some of your group might die and need to do a corpse run to the instance.

If you have a booster with you... you get 200 experience (per toon) for each mob you kill.
However the booster can gather 20 mobs at once, and kill them all in 15 seconds (plus pull time).
So you might be doing 30 mobs x 200 experience, or 6,000 experience per minute... which is a lot better than 4,000 experience every 4 minutes.
Also the low levels are in no danger of dying.
With RAF, and boosting... you generally run an instance 2-10 times and advance 10 or so levels and then move on to the next instance.



Tagging is where the low levels (in a group) damage each mob initially.
And then a higher level finishes the mob.
The high level takes the percentage of experience (even if they're level capped, and actually get none of it) away from the lower levels, unless they're within 10 or so levels (the maximum level disparity varies by character level, I think between 7 and 11 or something like that).

If you have two or more characters (low level) in the tagging group.
And the higher level only has pets finish the mobs (no character damage)... and totems, like the Shaman AoE pulsing fire damage, are considered pets...
The low levels get full experience.
For a tagger, you want all Stamina gear, preferably on an AoE class with something like Arcane Explosion that can be cast while moving.
Then have a group of Shaman (or other pet classes) outside of the group, to round-robin Stoneclaw and every place their Magma Totems...
Hopefully the Stoneclaw Totems taunt the mobs and stun them when they attack the totem, while the Magma Totems decimate the mobs who are a lot lower than the Shaman group.

That's the best method for tagging...
But boosting is a lot faster and safer for the lowbies.