On Dec 18, 2012, at 2:11 AM, krit tantanarat wrote:

Dear all

I am using MAC and try to select the atom by using Control + left click no mouse but it did not work.

How to picking atom from screen using MAC ? 

Hi Krit,
It really should work.  When you hover the mouse over an atom, does a little text balloon pop up saying what the atom is?  If you press the Control key while dragging the mouse with the left button held down, do you get a green rectangle drawn (with any atoms/bonds inside the rectangle selected)?  Finally, if you go to the Mouse preferences (Favorites->Preferences and change "Category" in the resulting dialog to "Mouse") and change picking (icon that sort of looks like a plus sign) to the "1" button (instead of "Ctrl+1") can you select atoms by just clicking the left button (without holding Control down)?

--Eric

                        Eric Pettersen

                        UCSF Computer Graphics Lab

                        http://www.cgl.ucsf.edu