Normally, when you edit a document, each time you type a letter, it's placed to the left of the cursor, which moves one space to the right, and any text that already exists is shuffled right. With overtyping, the existing text stays where it is, and each new letter you type simply replaces the existing text.
yes I have
helps you to know when you are over typing a word
Over typeing means that when you press INS, it basically eats over the words as you type.
Nothing
on my computer it opens your favorites but if you are typing it puts a diaeresis over the a
If there is a line over a decimal, it means the decimal is repetitive. If you are typing it would look like this... .7
Call a plumber.
slow typing speed and more errors
yes but the typing is not removed, it just types over the previous letter.
Difference between typing and non typing keys
A typing test is one taken to know typing skill level, speed, and accuracy.
The general rule over most of the internet - is that typing in block capitals is considered shouting. Unless you're typing an acronym - or emphasising the odd word, you should refrain from typing whole sentences in upper case. It's just unnecessary.