This is the "active mouse" which when clicked on buttons, may have significant effects, although on most terms it just sets the point to the text or term.

Use `(cm-(mouseleft))' for advice on what WOULD happen if you used `(mouseleft)'.

doc for active mouse IF YOU CAN SEE THIS go to http://www.cs.cornell.edu/Info/People/sfa/Nuprl/Shared/Xindentation_hack_doc.html