(xemacs.info)Representing Keystrokes

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2.1.1 Representing Keystrokes

XEmacs represents keystrokes as lists. Each list consists of an
arbitrary combination of modifiers followed by a single keysym at the
end of the list.  If the keysym corresponds to an ASCII character, you
can use its character code.  (A keystroke may also be represented by an
event object, as returned by the `read-key-sequence' function;
non-programmers need not worry about this.)

   The following table gives some examples of how to list
representations for keystrokes.  Each list consists of sets of
modifiers followed by keysyms:

`(control a)'
     Pressing <CTRL> and `a' simultaneously.

`(control ?a)'
     Another way of writing the keystroke `C-a'.

`(control 65)'
     Yet another way of writing the keystroke `C-a'.

     Pressing the <BREAK> key.

`(control meta button2up)'
     Release the middle mouse button, while pressing <CTRL> and <META>.
     Note: As you define keystrokes, you can use the `shift' key only
as a modifier with characters that do not have a second keysym on the
same key, such as `backspace' and `tab'.  It is an error to define a
keystroke using the <shift> modifier with keysyms such as `a' and `='.
The correct forms are `A' and `+'.

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