[求助]：ET工具中一个函数的用法

它山之石

以下为ET工具中的一个函数。判断某键是否按下。
ET已经提供了两个相关的函数。分别是
(ACET-SYS-SHIFT-DOWN)
(ACET-SYS-CONTROL-DOWN)
现在的问题是如何判断其它的键，如ALT的状态
下面这个函数中的keycode值是什么？
请对此有研究的朋友帮个忙解答下。


(acet-sys-keystate keycode)

Check state of virtual key.

Arguments
keycode The code for the virtual key to test.

Return Values
The status of the specified virtual key:

If the high-order bit is 1, the key is down; otherwise, it is up.
If the low-order bit is 1, the key is toggled. A key, such as the CAPS LOCK key, is toggled if it is turned on. The key is off and untoggled if the low-order bit is 0. A toggle key's indicator light (if any) on the keyboard will be on when the key is toggled, and off when the key is untoggled.
Note:
See the documentation for the GetKeyState() Win32 function for additional details.