http://www.autohotkey.com/

AutoHotkey is a free, open-source utility for Windows. With it, you can:

• Automate almost anything by sending keystrokes and mouse clicks. You can write a mouse or keyboard macro by hand or use the macro recorder.
• Create hotkeys for keyboard, joystick, and mouse. Virtually any key, button, or combination can become a hotkey.
• Expand abbreviations as you type them. For example, typing "btw" can automatically produce "by the way".
• Create custom data-entry forms, user interfaces, and menu bars. See GUI for details.
• Remap keys and buttons on your keyboard, joystick, and mouse.
• Respond to signals from hand-held remote controls via the WinLIRC client script.
• Run existing AutoIt v2 scripts and enhance them with new capabilities.
• Convert any script into an EXE file that can be run on computers that don't have AutoHotkey installed.

Getting started might be easier than you think. Check out the quick-start tutorial.

下面的脚本可以在ctrl+alt+n时，拷贝当前选中文本，然后启动记事本。。方法是先发ctrl-C，实现拷贝文本到剪贴板，然后启动自己的程序。（里面的粘贴部分不起作用，以后再研究。。。）