if you have firefox go to file>>new tab and click new window. onceyou have 2 windows open, go to runescape, select detail, and select a world
BOTH WINDOWS MUST NOT HAVE THE SAME WORLDS.
when both windows are done loading, log in with your 2 accounts that you made.
Presto, you got 2 accounts running and you can catch lobbies, mine ess or whatever you do to make money faster.
IE--just click "file" and new window, repeat process.