Middle Mouse Button
You can use the MIDDLE mouse button (LEFT+RIGHT on a two button mouse) for a variety of functions. For example:
• Click the MIDDLE mouse button to highlight the symbols between the outlined symbol or construct and the current position of the pointer.
• Click once on each character with the MIDDLE mouse button to highlight symbols one at a time.
• Click the MIDDLE mouse button at either end to extend or reduce the highlighted region.
• Hold down the MIDDLE mouse button while dragging to extend or reduce highlighting.
• In the Palette, hold down the MIDDLE mouse button to drag Palette buttons from one place to another on the Palette.