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You can follow this link to verify the compatibility of your machine or download the Java VM.
You always play first with black. The default level is 0, and is usually enough to defeat most human players. The program at that level plays almost immediately, but you can experience a network lag; the program is running on our machines, and the applet only sends the current position and displays the response. Level 1 is 1 second/move and level 2 is 3 seconds/move.
If you have to pass (the program displays "You pass" in the information box), just click anywhere on the board to go on.
Reversi rules can be found here.