Fujitsu Siemens Computers Fujitsu-Siemens PC - Manual (Page 78)

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The <Ins> key
The <Ins> key is the Insert key. In the operating system mode,
characters on the screen can be replaced by being overwritten with
a new character. The <Ins> key can be switched to the insert
mode, and the newly entered characters are inserted at the cursor
position.
Please note that the use of this key may be program-dependent.
The <Del> key
The <Del> key is used to delete the character at which or before
which the cursor stands.
Programs may assign this key other functions.
Cursor keys
The keys in the cursor keypad and the correspondingly designated
keys of the numeric keypad have the same use. It is also possible
for programs to assign other uses to these keys.
< >
moves the cursor one line up
< > moves the cursor one line down
< > moves the cursor one character to
the right