This will then highlight everything in that sentence. To select a sentence, triple-click with the left button on your mouse at the start of the sentence. To select a word double-click the left button on your mouse quickly (as you did you before to launch a file or program) whilst the pointer is position on the word you would like to select. This will highlight multiple files or text. However if you wish to select multiple files or text, press the left button on your mouse and drag the pointer over the files or text you wish to select. To select one object or icon on your screen, press the left button of your mouse once whilst the pointer is positioned on the desired object you wish to select. To select and highlight an object or text NOTE: If you click slowly you will NOT launch the file or program you wish to use. Place the mouse pointer over the file or program you wish to launch and double-click on the left mouse button quickly. The left button on a mouse is the default button used to click, select, drag to highlight a word and/or object and used as a pointer.
This resource will explain the functions of different buttons on Windows and Apple computer mice.