The first section in the Triggers tab is the Mouse palette. Opus can respond to the activity of the mouse – it can respond to:
Mouse click triggers – a click or double click from the left or right mouse button.
Mouse movement triggers – when you move the mouse over or off an object or when you simply move the mouse.
Note:
You can set the mouse button to repeat its action, if the mouse button is held down – just like auto-repeat on the keyboard. The Mouse held down auto repeats option is available on the General tab of the Properties dialog for the object.