In the duel arena, its 1 vs. 1, however in certain parts of the wilderness you can yes.
You must be 13, or older to register for runescape.
The tier 4 cap shows that the player has won 500-1999 duels.
In the modern RuneScape, you can go play in PvP world - there you can attack other players, and get attacked. There is RuneScape Classic (the old RuneScape). You can't currently join, but it seems that in May 2010, then in November 2010, you can join again - if you have a RuneScape membership.
You can't. Only those who made accounts in the past, before the current Runescape, can join.
there are no cheats on duels.
Must get 32 Quest Points.
You can join Regalcrime but you don't have to ;)
Think of a clan name, then get people to join, simple.
join clan 291622 in runescape
You can have duels with your friends on harrypotter.com
Shadowrun Duels was created in 2003.
You can't "join" Jagex. You can join Runescape. If you are talking about working for Jagex and being able to change levels, I highly doubt it.