Canthan Characters in Tyria ?

ive seen some confusion on this so i thought id ask for clarification.

once Canthan chararcter cross over to Tyria, what can, or cant they do mission/quest wise ?

or vice versa for that matter with Tyrian Characters going across to Cantha ?

where do they pick up ? if at all.. etc... ?

anyone that has looked into this, some clarification, without spiolers, would be appreciated

I think they pick up from LA and can do quests in the jungle, desert, southern shiverpeaks and Fire Islands. I heard they can go to Ascalon and northern shiverpeaks but cant do the missions. Someone can correct me if i am wrong.

You have to talk to the Skill guy (Sergio) in Lions Arch and do the new quest. :P