I have the only thing in the documentation on that function is what follows 
IsKeyPressed($key) 
Wrapper around the GetAsyncKeyState API function. Returns TRUE if the 
+user presses the specified key.

    IsKeyPressed("ESC");
    IsKeyPressed("A");
    IsKeyPressed("DOWN");

[download]
According to it, all of these should work.

In reply to Re^2: Win32::GuiTest IsKeyPressed function by coldmiser
in thread Win32::GuiTest IsKeyPressed function by coldmiser

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