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On Win32, I wonder how to detect whether Left Shift or Right ALT is pressed using Perl, Python, or Ruby (or even in C)?
Not just for the current window, but the global environment overall. Example: when I am typing a document, I can press Right ALT to start the music player written in Ruby, and then press Right ALT again and it can pause or stop the program. thanks.
You need to setup a Low Level Keyboard Hook. You do this by calling SetWindowsHookEx with a LowLevelKeyboardProc, and then watch for the appropriate virtual key code.
There are key codes for left and right shift and alt keys.