Editing Nav cluster (section)

==Usage==
===Delete key===
The Delete key is used to delete the character to the right of the cursor. The cursor is stationary.
{{main|Delete key}}

===Insert key===
In older programs, the Insert key is modal, swapping between ''overwrite mode'' and ''insert mode''. In modern programs, insert mode is often the default or the only mode.
Even though the key is used as a modal key, no modern keyboard protocol has support for a lock light. Mode is instead often indicated by the shape of the text cursor.

In some older programs such as in the MS DOS prompt in [[Microsoft Windows]], Control+Insert is used to Copy and Shift+Insert is used to Paste. This is still commonly available on Linux and is still supported by some MacOS applications.

===Home and End===
When browsing a document, Home and End moves to the top and the bottom of the document, respectively.
The typical usage for Home/End keys when editing text is to move the cursor to the beginning/end of the current line, but move to top/bottom if the Control key was held.

Text programs on [[MacOS|Macintosh]] tend to use the browsing usages also in text editors and word-processing programs, moving the cursor to the first character or the last character in the text document.

Many vintage computer platforms such as [[Commodore 64]] and [[Atari ST]] had only a Home key, moving the cursor to the top/left of the screen.
Shift + Home was [[Clear key|Clear]], which also moved the cursor home.

===Page up and Page Down===
Page Up and Page Down moves one page's worth of text up and down respectively. Most programs for text editing or word processing move the cursor at well. Scrolling behaviour varies especially among text-mode programs.

In some programs the document can be moved without moving the cursor if the [[Alt key|Alt]] or [[Control key|Control]] key is held down.

===Help key===
The Help key typically activates an on-screen user manual for the current window/program.
{{main|Help key}}

===Undo key===
The Undo key performed the Undo function in the current program.