listening to Xserver

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http://www.linuxforums.org – I need to know on Linux when a user press a key or use a button of his mouse even when my app is not in focus. I only successed in writing a program that listen to an event when the window is in focus using xSelectInput. The problem is that I can have these events only if I make a client window which have the focus on it [I use these maks XSelectInput(display, win, KeyPressMask |ButtonPressMask); ] If I ask directly for the main root window events [XSelectInput(display, root_window, KeyPressMask |ButtonPressMask);] I get an error msg. how can I listen to all keypressed/release events ? Thanks in advance. (HowTos)