keycode — The internal, frequently numeric, identifier for a key on a keyboard
keycode ::=
altanchorannotationbibliorefindexterm (db.indexterm.endofrange)indexterm (db.indexterm.singular)indexterm (db.indexterm.startofrange)inlinemediaobjectlinkolinkphrase (db._phrase)remarkreplaceablesubscriptsuperscriptxrefThe KeyCode identifies the numeric value associated with
a key on a computer keyboard. This is distinct from any scan code
that it may generate (KeyCode), or any symbolic name
(KeySym) that might exist for the key.
These elements contain keycode: bridgehead, citation, citetitle, classsynopsisinfo, emphasis (db.emphasis), entry, firstterm, funcsynopsisinfo, glosssee, glossseealso, glossterm, html:button, html:label, html:legend, link, literallayout, member, olink, orgdiv, para, phrase (db.phrase), primary, primaryie, programlisting, quote, refdescriptor, refentrytitle, refname, refpurpose, screen, secondary, secondaryie, see, seealso, seealsoie, seeie, seg, segtitle, simpara, subtitle, synopsis, td, term, termdef, tertiary, tertiaryie, th, title, titleabbrev, tocentry.
The following elements occur in keycode: text, alt, anchor, annotation, biblioref, indexterm (db.indexterm.endofrange), indexterm (db.indexterm.singular), indexterm (db.indexterm.startofrange), inlinemediaobject, link, olink, phrase (db._phrase), remark, replaceable, subscript, superscript, xref.
accel, guibutton, guiicon, guilabel, guimenu, guimenuitem, guisubmenu, keycap, keycombo, keysym, menuchoice, mousebutton, shortcut<article xmlns='http://docbook.org/ns/docbook'> <title>Example keycode</title> <para>The <keycap>F1</keycap> key on an IBM PC keyboard generates the scan code <keycode>0x3B</keycode> when pressed. This value is defined as <keysym>KEY_F1</keysym> in <filename class="headerfile">keyboard.h</filename>. </para> </article>
The F1 key on an IBM PC keyboard generates the
scan code 0x3B when pressed.  This value
is defined as KEY_F1 in 
keyboard.h.