Open a word processing application to test the keys.
If you've spent much time on the computer, you have probably noticed that the space bar and other keys can delete the characters in front of the cursor. This functionality is called "Insertion," and can be useful as long as you meant to turn it off. In most cases, the "Insert" function is turned off by accident, since the "Insert" key is normally located right next to the "Delete" key. By turning on this functionality, you can insert characters in front of others without deleting them.
Press the "Insert" key on your keyboard. If you're using a laptop, the "Insert" command might share the same key as the "Num Lock" key.
Continue typing to verify that the Insert functionality is turned on.
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