You can customize the behavior of a mouse or other pointing device in the Customize
User Interface (CUI) Editor. If a pointing device has more than two buttons, you can
change the behavior of the second and third buttons. The first button on any pointing
device is reserved for the operating system and cannot be defined as part of the customization
(CUIx) file.

By using the Shift and Ctrl keys, you can create a number of combinations to suit
your needs. Your pointing device can recognize as many commands as it has assignable
buttons. The Mouse Buttons section is organized by keyboard combination such as Click,
Shift+Click, Ctrl+Click, and Ctrl+Shift+Click. Tablet buttons can also be customized,
but are numbered sequentially instead of by keyboard combination. Drag a command to
a mouse button combination to assign a command. Create additional buttons by dragging
commands to a node under Mouse Buttons.

The following table shows the Click mouse button properties as they appear in the
Properties pane of the Customize User Interface (CUI) Editor.

Accept Coordinate Entry

When you click one of the buttons on a multi-button pointing device, the program reads
not only the button number but also the coordinate of the crosshairs at the time you
click. By carefully constructing macros, you can choose to either ignore the coordinate
or use it with the command activated by the button.

Including a backslash () in a command macro introduces a pause for user input. For the Mouse Buttons and
Digitize Buttons menus, the coordinate of the crosshairs is supplied as user input
when the button is clicked. This occurs only for the first backslash in the command;
if the item contains no backslashes, the crosshairs coordinate is not used. Consider
the following command macros:

line
line 

The first command macro when assigned to a button starts the LINE command and displays
the

Specify first point:

prompt in the normal fashion. The second command macro when assigned to a button
also starts the LINE command, but the program uses the current crosshairs location
at the

Specify first point:

prompt and displays the

Specify next point or [Undo]:

prompt.