托管线程或者是后台线程，或者是前台线程。
A managed thread is either a background thread or a foreground thread.
安装一个钩子子程，当应用程序的前台线程即将空闲时，该子程被调用。
Installs a hook procedure that will be called when the application's foreground thread is about to become idle.
系统在应用程序的前台线程即将空闲时，调用WH _ FOREGROUNDIDLE钩子子程。
The system calls a WH_FOREGROUNDIDLE hook procedure when the application's foreground thread is about to become idle.
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