Hi Rob, On a Mac with a one-button mouse, buttons 2 and 3 can be emulated with the option and apple (clover) keys, respectively. For example, click-dragging with the option key pressed performs XY-translation (assuming default Mouse preferences). However, in Mac OS Leopard (10.5), this emulation of a 3-button mouse is off by default; you have to turn it on in the Input section of the X11 preferences. Here are the relevant man pages, although I think I summarized everything above. http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/mouse.html#2button http://www.cgl.ucsf.edu/chimera/1.2492/osx_x11.html I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. meng@cgl.ucsf.edu UCSF Computer Graphics Lab and Babbitt Lab Department of Pharmaceutical Chemistry University of California, San Francisco http://www.cgl.ucsf.edu/home/meng/index.html On Mar 26, 2008, at 3:32 PM, Robert Hilton wrote:

When using Chimera, I want to be able to use XY translation. In the help menu, I found that if I hold down the middle mouse button, I can control XY translation. However, I have a mac, and so have no middle mouse button. How can I control XY translation using a mac? Thanks, Rob Hilton hiltonlds@gmail.com