Keyboard mapping================This release of rdesktop uses a new, portable keyboard mappingimplementation. It should hopefully work on all X11 systems. This newimplementation only looks at X11 keysyms: Not on (nonportable)keycodes or modifier status. This means that rdesktop will obey yourlocal keyboard configuration. For example, if you have swappedCapsLock and Control, rdesktop will use this mapping. XKB is currently not used. It seems like a good idea to me, but sincesome X servers (like Xvnc) does not support XKB, we still need to usethe plain old interface as well, at least. There are still some small problems.* CapsLock: CapsLock changes are never sent to the RDP  server. rdesktop does not know which keys that are modified by  CapsLock and which are not. So, the CapsLock indicator in Wordpad  etc will always be off.Composing/Multi_key is supported. For more information, see:  MIT:              $SRC/xc/nls/X11/locale/Compose/iso8859-1  XFree86:          /usr/X11R6/lib/X11/locale/*/Compose  Solaris' Openwin: /usr/openwin/include/X11/Suncompose.h                    /usr/openwin/lib/locale/*/Compose  Irix6:            compose(5)Keymap files============The names of the keymaps follows RFC1766. (You can find a translation from Windows keyboard layout numbers tokeymap names by looking atHKEY_LOCAL_MACHINE\SOFTWARE\Classes\MIME\Database\RFC1766 in theregistry.)Contents of keymap files========================The keymaps are line based. There are four different types of lines:1) include linesSyntax:include <another-map-file>Example:include common2) map linesSyntax:map <hex-number>Example:map 0x41dMap-lines specifies how the remote RDP server should interpret thesent scancodes. 3) Translation linesSyntax:<keysym-name> <scancode> [flags..]Example:onehalf 0x29 shiftThe scancode can be found in scancodes.h. Note: The scancode value forextended keys can be calculated by OR:ing with 0x80. Example: TheDelete key have the scancode sequence 0xe0, 0x52. You can get thescancode value to put into the map file by running:python -c "print hex(0x80 | 0x52)"If flags are "altgr", "shift", the scancode sent for this keysym willbe prefixed with AltGr, or Shift.If flags includes "addupper", a translation for this keysyms uppercasename will be added as well, in addition to the non-uppercasename. Example:x 2d addupper...will add an translation for "X" automatically, just like if youwould specify:X 2d shiftIf flags include "localstate", the modifier to send will be determinedby the local modifier state. If flags is "inhibit", nothing will be sent to the server. If flags is "numlock", rdesktop will make sure that the remote NumLockstate is on before generating the key event. Otherwise, it will makesure NumLock is off.4) enable_composeIf any line starts with the keyword "enable_compose", rdesktop willenable local Compose/Multi_key handling. Enabling this will often makeit impossible to compose characters with dead keys (on the remoteside). This is because when local compose support is enabled, deadkeys will not be sent to the remote side. 5) sequence linesSyntax:sequence <event-keysym-name> <keysym-name1> <keysym-name2> ...Examples:sequence eacute dead_acute esequence F12 f o o at e x a m p l e period c o mSequence lines allows you to specify that multiple scancodes should besent to the RDP server, in response to one X11 keyboard event. Note:The sequence is sent at the X11 KeyPress event. Nothing is sent atKeyRelease.6) keyboard_type linesSyntax:keyboard_type <hex-number> keyboard_type lines specifies the keyboard type. Default value is 0x4(en-us 101/104 keys keyboard).7) keyboard_subtype linesSyntax:keyboard_subtype <hex-number>keyboard_subtype lines specifies the keyboard subtype. Default valueis 0x0 (en-us 101/104 keys keyboard).8) keyboard_functionkeys linesSyntax:keyboard_functionkeys <hex-number>keyboard_functionkeys specifies the number of keyboard functionkeys. Default value is 0xc (12, for standard 101/104 keys keyboard).Suggested X11 keysym mapping on PCs===================================Unfortunately, there is no standard for which keysyms a given keyshould generate. If you have a PC-keyboard with Windows keys, I suggest this mapping:Keyboard keys:CtrlLeft WinLeft AltLeft Space AltGr WinRight Menu CtrlRight...should generate keysyms:Control_L Super_L Alt_L space Mode_switch Super_R Menu Control_RAdditionally:Shift-Alt should produce Meta_LShift-AltGr should produce Multi_Key. Use a modifier-map like this:shift       Shift_L (0x32),  Shift_R (0x3e)lock        Caps_Lock (0x25)control     Control_L (0x42),  Control_R (0x6d)mod1        Alt_L (0x40)mod2        Num_Lock (0x4d)mod3        Mode_switch (0x71)mod4        Super_L (0x73),  Super_R (0x74)mod5        Scroll_Lock (0x4e)Updating / writing keymap files===============================When writing new or updating keymap files, please use comments andblanks, to increase readability. The "sv" keymap is a good template. When you need to add a translation to a keymap file, do:    1. Get the "key number" for this key, by looking at keynums.png.     2. Take a look at scancodes.h, and look for    SCANCODE_KEY_<my-key-number>. The scancode value is at the end of    the line. If the line contains (SCANCODE_EXTENDED | 0xsomething),    then you should OR 0x80 to this value. For example, you can do:        python -c "print hex(0x80 | 0xsomething)"    3. Put the scancode (from step 2) and keysym name (found in the    error message) into the keymap file. Special keys============* The combination Ctrl-Alt-Enter toggles between fullscreen and  non-fullscreen mode. * Meta, Hyper and Super are treated as windows keys. RDP4 does not  support the windows keys though, so if you are running RDP4, these  keys will translate to Ctrl-Esc. Links=====http://www.win.tue.nl/~aeb/linux/kbd/scancodes.htmlTest cases==========When changing the keyboard code, make sure all these tests in Notepadworks:1. Ctrl+f should bring up Find dialog, with CapsLock both on and off. 2. Ctrl+Shift+arrows should mark text, with CapsLock both on and off. 3. Test a sequence, like egrave. 4. Test a char generated with AltGr, such as @ on a swedish keyboard. 5. Test Ctrl-Alt-Delete. 6. Ctrl-Alt-Enter should toggle fullscreen. 7. Test NumLock synchronization using the -N option. Excel is able to   indicate the current NumLock state. Verify that the status is   updated correctly on reconnects. 8. Test the Windows keys, standalone as well as in combination with,   say, E.9. Make sure the system menu (via Alt-space) cannot be accessed in   single app mode.10. Make sure keymaps can be loaded from ~/.rdesktop/keymaps,    KEYMAP_PATH, $CWD/keymaps, and from an absolute path. 11. Press Shift, then press a key modified by shift, the release    shift, then release the other key.  Do this in a speedy fasion.    Make sure the shift state is not stuck down.12. Test all numpad keys, when not using the -N option. 13. Map a single, un-shifted key (such as F1) to XK_A:    xmodmap -e "keycode 67 = A A"    Perform in Notepad:    * Write some text    * Press F1    * Press b    * Release b    * Release F1    Verify that shift is not stuck down, by clicking on the text.