We can enter special characters by holding the [Alt] key down and typing a 3 or 4 digit code.
Alt + xxx
On modern computers you can insert special characters with a simple click (using table of special characters...), but it was not the case during the early days of computing. Special commands were required to create accented letters, typographical signs, pictograms (such as spades, hearts, clover ) or smileys and graphics for drawing frames and borders.
Using the Alt codes
It will be quite difficult to memorize all of the Alt codes, so the trick is to memorize the commonly used ones.
What may prevent many beginners from entering special characters, is due to the fact that they release the Alt key too soon. Release the Alt key only after typing all the numbers.
The second common mistake is to make use of the number keys placed on the second (top) row of the keyboard./ It is compulsory to use the numeric keypad on the right of the keyboard to enter special characters.