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Not all emulators support key mapping of the tab key. The game gripper uses this tab key for the left part of the dpad.
We have contacted developers about adding support for the tab key and they have promised us they would look into it.
Send an email to the developer of your favorite emulator. We think it would really help if they also hear about it from their users.
Applications are available that let you remap all keys on the keyboard on a system wide basis.
You could configure it that it does a remapping of the tab key every time you start up your emulator.
You can find more information here: http://forum.xda-developers.com/showthread.php?t=801679