displaykeyboardmacmouse
I would like to control two cursors with two mice in the same time, as well as have two keyboards for separate control and text input.
My goal is to have two users on one computer, so I can let my brother to play/chat anything while I do my job. If we have two monitors, then I don't need to buy a new computer.
If you know of some software that can do this, please let me know.
If you have a keyboard similar to the one described here, it sounds like you can just pop the keys off and push them back down in the new position.
I don't know of a way to make it only pair with a single KB/M/Trackpad, so a workaround it to prevent it pairing with anything further once you have paired what you need.
One method to do this, on the assumption that the users of the computers do not have administrator access:
Step one - turn on parental controls for the users of the systems in System Preferences > Parental Controls:
Then turn on Limit Applications, and scroll down to untick System Preferences under Allowed Apps > Other Apps
Now make sure that the Bluetooth menu bar item isn't shown in System Preferences > Bluetooth:
Obviously this may prevent legitimate access to other system preference items, but as I cannot find a way to lock down Bluetooth to Admin access only, then the next best thing is to prevent you from getting to the Bluetooth config areas. It may still be possible to manually start the Bluetooth assistant, perhaps someone could comment on that.
Best Answer
You can achieve something very close to this with a virtual PC solution. I tried it with Parallels. For simplicity I'll assume you run Mac OS X on the "real" computer and Windows in Parallels (of course you can run another OS too, I just picked one to keep the story simple).
In the Parallels settings, you can choose which USB devices should be connected to the Mac and which to Windows. If you connect your external keyboard and mouse to Windows, you get a warning that this will disable input from them on the Mac, but this is exactly what you want. Be sure to disable mouse pointer synchronization (in version 5 it's called "SmartMouse"), otherwise you won't see the Windows mouse pointer.
Now you can use the external keyboard and mouse only in Windows, and the main keyboard and mouse anywhere. This is also useful if you want to override something your brother is doing :-)
Doing this in a Mac only environment is currently not possible because it would require changes in the window manager, which is part of the OS. There is a project that does this for the X window manager, but this will not work to control every window on your Mac. TeamPlayer is software that allows you to control Windows with multiple mice, but with the exception of their own programs, you control the computer in turns: only one mouse can give real clicks, the others must wait for their turn.
A complete solution is Userful, but this runs only on Linux, because, as I said, it requires modifications at different places in the software stack and only Linux is open enough to allow this. Microsoft created a similar project: Windows MultiPoint Server, but this is targets to schools and I doubt you can get it. And of course, it only runs on Windows.