Because most users are right handed and the index finger is the predominantly used finger and is more dextrous than the middle finger on a normal mouse.
just try lightly resting your finger on a table and gently tap the table with just the middle finger first then the index finger - most people would find it easier to control the index finger and/or to tap faster.
Because most people are right handed and it is easier and more comfortable to use your index finger rather than your middle finger
Unless configured otherwise, the left mouse button normally functions as the primary button on consumer-grade mouses.
The primary mouse button would be the left-click.Without it you wouldn't be able to open/run programs with your mouse. Also people use the left-click more than right.You can make either button the primary mouse button, the default is the left button.By going to;Start-->Control Panel-->Printer and other Hardware-->Mouse
LMB is the left mouse button
The mouse button that is the most used is the 'left side' of the mouse.
I have a Microsoft Wireless Laser Mouse 6000 and it has two side buttons along with the left and right click buttons.
On a Mac the Secondary Mouse Button is what is often called a Right Click - The primary button being the Left Click. When you click the Secondary/Right hand button you will see a menu of options appear from the mouse pointer. You can move your mouse down the list of options and click on an appropriate item. The contents of the menu will vary depending upon which application you are using when you click - which is why the menu is known as a Context menu. In the Mouse section of System Preferences you can configure the Secondary button to perform some task, other than activating the menu, like opening Spotlight to search for something.
The left button, which is the primary button as default to many mouse settings, is to command the basic way of communicating with the computer to act. It may have various functions defined for it. Particularly for the left-handed.
On a PCs and Linux the left mouse button is used for clicking, or selecting files ect. The right mouse button is used for opening up menus related to the item for help. There is no right mouse button on Macs, but only the left mouse button with the same functions.
The mouse buttons are configured in the Mouse section of System Preferences .
Left Mouse Button
Button one refers to the left mouse button. Button two is the right mouse click, or, if you're using a mouse without a left and right button, it is shift+click. Button three is pressing down the scroll wheel. Hope this helped! :-)
Yes, but the left button is used more often.(The left button is the default action button, while the right button is the default context button. These can be switched if the user wants them to be switched, such as if the user if left-handed.)
Right-click means press the right mouse button. Left-click means press the left mouse button.