RISC OS Keymapping
                                        ==================

+===+======+======+====+====+====+====+====+====+====+====+=======+=====+=====+=====+======+======+
|   |  x0  |  x1  | x2 | x3 | x4 | x5 | x6 | x7 | x8 | x9 |  xA   | xB  | xC  | xD  |  xE  |  xF  |
+===+======+======+====+====+====+====+====+====+====+====+=======+=====+=====+=====+======+======+
|00x|      |      |    |    |    |    |    |    | BS | Tab|       |     |     |Retrn|      |      |
+---+------+------+----+----+----+----+----+----+----+----+-------+-----+-----+-----+------+------+
|01x|      |      |    |    |    |    |    |    |    |    |       | Esc |     |     | Home |      |
+---+------+------+----+----+----+----+----+----+----+----+-------+-----+-----+-----+------+------+
+---+------+------+----+----+----+----+----+----+----+----+-------+-----+-----+-----+------+------+
|07x|      |      |    |    |    |    |    |    |    |    |       |     |     |     |      |  Del |
+---+------+------+----+----+----+----+----+----+----+----+-------+-----+-----+-----+------+------+
|18x|  F0  |  F1  | F2 | F3 | F4 | F5 | F6 | F7 | F8 | F9 |  Tab  | End | <-  | ->  |  Dn  |  Up  |
|   | Prnt |      |    |    |    |    |    |    |    |    | Break |     |     |     | sPgDn| sPgUp|
+---+------+------+----+----+----+----+----+----+----+----+-------+-----+-----+-----+------+------+
|19x| sF0  |  sF1 | sF2| sF3| sF4| sF5| sF6| sF7| sF8| sF9|  sTab | sEnd| s<- | s-> |  sDn | sUp  |
|   |sPrnt |      |    |    |    |    |    |    |    |    | sBreak|     |     |     | PgDn | PgUp |
+---+------+------+----+----+----+----+----+----+----+----+-------+-----+-----+-----+------+------+
|1Ax| cF0  |  cF1 | cF2| cF3| cF4| cF5| cF6| cF7| cF8| cF9|  cTab | cEnd| c<- | c-> |  cDn | cUp  |
|   |cPrnt |      |    |    |    |    |    |    |    |    | cBreak|     |     |     |scPgDn|scPgUp|
+---+------+------+----+----+----+----+----+----+----+----+-------+-----+-----+-----+------+------+
|1Bx| scF0 | scF1 |scF2|scF3|scF4|scF5|scF6|scF7|scF8|scF9| scTab |scEnd|sc<- |sc-> | scDn | scUp |
|   |scPrnt|      |    |    |    |    |    |    |    |    |scBreak|     |     |     | cPgDn| cPgUp|
+---+------+------+----+----+----+----+----+----+----+----+-------+-----+-----+-----+------+------+
|1Cx|  LWin| Menu |    |    |    |    |    |    |    |    |  F10  | F11 | F12 | Ins | MsDn | MsUp |
|   | sRWin|      |    |    |    |    |    |    |    |    |       |     |     |     |      |      |
+---+------+------+----+----+----+----+----+----+----+----+-------+-----+-----+-----+------+------+
|1Dx| sLWin| sMenu|    |    |    |    |    |    |    |    |  sF10 | sF11| sF12| sIns|sMsDn |sMsUp |
|   |  RWin|      |    |    |    |    |    |    |    |    |       |     |     |     |      |      |
+---+------+------+----+----+----+----+----+----+----+----+-------+-----+-----+-----+------+------+
|1Ex| cLWin| cMenu|    |    |    |    |    |    |    |    |  cF10 | cF11| cF12| cIns|cMsDn |cMsUp |
|   |scRWin|      |    |    |    |    |    |    |    |    |       |     |     |     |      |      |
+---+------+------+----+----+----+----+----+----+----+----+-------+-----+-----+-----+------+------+
|1Fx|scLWin|scMenu|    |    |    |    |    |    |    |    | scF10 |scF11|scF12|scIns|scMsDn|scMsUp|
|   | cRWin|      |    |    |    |    |    |    |    |    |       |     |     |     |      |      |
+---+------+------+----+----+----+----+----+----+----+----+-------+-----+-----+-----+------+------+

Within the desktop TAB is programmed to be soft key 10 and BREAK does Break/Reset actions. In Wimp
Messages special keypresses are ORed with &100 to distinguish them from top-bit-set characters.