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Lisp “event” object is a representation of input, regardless of actual or expected. If it’s a keypress for example, it tells which key with which modifiers are pressed, and that’s all. Please do not confuse it with X or other’s event which is generated only after keypress or other “event”.
Each X input event induced by the mouse or the keyboard has a Lisp representation. X input events that Sawfish receives are either for the root window, the window frames it creates, or grabbed from the client windows themselves.
Sawfish can respond to X events other than input, most often via hooks. (see Standard Hooks)
This function returns t
if its argument is an event.