GET_INFO(MOUSE_EVENT_KEYWORD)

     For an overview of the GET_INFO built-in, see the HELP topic GET_INFO.

     The following string can be used for parameter2 when parameter1 is a
     DECTPU keyword for the down click of a mouse button (M1DOWN...M5DOWN):

       Parameter 2       | Return Value (Parameter 1 is M1DOWN...M5DOWN)
      -------------------+------------------------------------------------+
       "mouse_event_     | Integer   - The number of the specified mouse
        keyword"         |             button.  For example, if you specify
                         |             the keyword M2DOWN, the call returns
                         |             the integer 2.
     --------------------+--------------------------------------------------+

     When parameter1 is a keyword describing a mouse button event, you can
     use GET_INFO to determine the window where the current mouse operation
     started.  When you use GET_INFO to fetch this information, the valid
     keywords for parameter1 are as follows:

             M1UP     ...   M5UP
             M1DOWN   ...   M5DOWN
             M1DRAG   ...   M5DRAG
             M1CLICK  ...   M5CLICK
             M1CLICK2 ...   M5CLICK2
             M1CLICK3 ...   M5CLICK3
             M1CLICK4 ...   M5CLICK4
             M1CLICK5 ...   M5CLICK5

     The following string can be used for parameter2 when parameter1 is a
     DECTPU keyword for a mouse button event:

       Parameter 2       | Return Value (Parameter 1 is mouse event keyword)
      -------------------+-------------------------------------------------+
       "window"          | Window    - The window in which the down-click
                         |   or        occurred that started the current
                         | Integer 0   drag operation.  If no drag operation
                         |             is in progress for the specified
                         |             mouse button, returns 0.
     --------------------+--------------------------------------------------+