There are pre-defined constants corresponding to usually non-typable keys on the keyboard. When a Lisp function calls for a virtual key argument, one of the pre-defined constants is suitable as an argument value. The word after the hyphen names the key, in this case, the left mouse button.
Common Graphics and IDE documentation is described in About Common Graphics and IDE documentation in cgide.htm.
The documentation is described in introduction.htm and the index is in index.htm.
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Created 2000.10.5.