Graphical Input with a Mouse
The default button mapping listed in the Button Mappings dialog are appropriate for a two-button mouse, and allow you to simulate having a third mouse button:
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The Data button, which is used to enter data points, is mapped to the left-hand mouse button.
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The Reset button, which is used for resetting and for accessing the Reset pop-up menu and the view control pop-up menu, is mapped to the right-hand mouse button.
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The Tentative button, which is used to enter tentative snap points , is invoked by clicking the left-hand and right-hand mouse buttons at the same time. This is called a button "chord" and serves as a third button.
If you are using a three-button mouse, you may want to change Tentative to use a single button (rather than the two-button chord) for faster operation.