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Single click
single click single normal* mouse click (*left vs. right)
 vs. double
single click double normal* mouse click (* see left vs. right)
single click double normal* mouse click (* see left vs. right)

Right clicking or perhaps more appropriately, alternate clicking is how to open context menus like this one when alternate clicking a blank area of the desktop...

Desktop context menu

Left handed?  You may want to switch the mouse buttons...

right click