>
>
> I tried p9p Acme on Mac OS X, seems the mouse button emulation with
> trackpad is broken, p9p Acme doesn't response to Shift + Secondary Click,
> this is probably my problem, won't play it now until I'm more familiar with
> 9front in Virtualbox.
>

Alt+Click does a middle click (button 2), Command+Click does a right click
(button 3). Also, Command+Z does what's expected.