The Mouse

Left & Right Click

When you left click.
To open a folder or file on your desktop or in a folder.(Double click)
Just single click on menu's
To Drag, Drop or select a file/program.(Single click keeping it pressed down)&



Left Click for Selecting, Clicking & Dragging

When you right click.
To bring up options on a file or folder.
To drag a file to folder and get an option on what to do with it.

Right Click gives you options.