Return java.awt.KeyEvent constant meaning (Java) keycode, derived from X keysym. Some keysyms maps to more than one keycode, these would require extra processing.

Return java.awt.KeyEvent constant meaning (Java) keycode, derived from X Window KeyEvent. Algorithm is, extract via XKeycodeToKeysym a proper keysym according to Xlib spec rules and err exceptions, then search a java keycode in a table.

Return keysym derived from a keycode and modifiers. Usually an input method does this. However non-system input methods (e.g. Java IMs) do not. For rules, see "Xlib - C Language X Interface", MIT X Consortium Standard X Version 11, Release 6 Ch. 12.7 XXX TODO: or maybe not to do: process Mode Lock and therefore not only 0-th and 1-st but 2-nd and 3-rd keysyms for a keystroke.

Return an integer java keycode apprx as it was before extending keycodes range. This call would ignore for instance XKB and process whatever is on the bottom of keysym stack. Result will not depend on actual locale, will differ between dual/multiple keyboard setup systems (e.g. English+Russian vs French+Russian) but will be someway compatible with old releases.