2nd Mouse Button on Mac

[Bradley Vance]

Hello,
	I've started using the VNCviewer enterprise edition from realVNC,  
and cannot figure out
how to emulate the 2nd and third mouse buttons on my iBook...   It  
works fine when I use
an external multi-button mouse, but I don't always have an external  
mouse, so need to figure
out how to emulate those buttons from my iBook....
	There preferences indicate that you CAN emulate the multi-button- 
mouse, but I was
unable to figure out HOW to do it...

-Brad