Map a Function Key
You can use these steps as a guideline for mapping any key that is listed in the Explicitly mapped keys on the Map Key tab in the Keyboard Maps dialog box.
Suppose that your X client requires a function key (such as F23) that you don't have on your keyboard. You can map one of your function keys (such as F10) to send the F23 X Keysym.
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An X Keysym is an encoding of a symbol on the cap of a key. The set of defined X Keysyms includes the ISO Latin character sets, Katakana, Arabic, Cyrillic, Greek, Technical, Publishing, APL, Hebrew, Thai, Korean, and other keys found on keyboards such as Return, Help, and Tab.
A list of X Keysyms is associated with each keycode. The list is intended to convey the set of symbols on the corresponding key. Standard rules for obtaining an X Keysym from a KeyPress event make use of only the first four X Keysyms associated with a keycode. Depending on the state of the Shift and ModeSwitch (AltGr) modifiers, one of the first four keysyms will be selected.
To map the unshifted F10 to send the F23 X Keysym
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In X Manager or X Manager for Domains, click Tools > Keyboard Maps.
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For Select Keyboard Map, select an editable keyboard map.
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The default keyboard maps are not editable. Click Clone to create a new custom keyboard map based on an existing keyboard map.
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Use the Map Key tab (displayed by default).
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In the list of Explicitly mapped keys on the left side of the tab, select the F10 key. (As an alternative, you can click the + sign in Explicitly mapped keys to open the Add or Find Key dialog box. With your cursor in the Press a key field, press F10, then click OK.)
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With the F10 key selected, click the first Change Mapped X Keysym button (next to the Unshifted key description).
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In the Change Mapped X Keysym dialog box, use the following steps to select F23. (Since this is not a physical key on your keyboard, you must select it from the list.)
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Set Filter X Keysym list by category to Function Keys.
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In Select X Keysym from list, select F23.
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Click OK.
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The Map Keys tab now shows that the F10 key is mapped to the F23 X Keysym.
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Administrators can also configure Keyboard Maps from the Domain Definitions tab
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