                                     Char Overview

    A Character is a single byte holding an ASCII code for a letter, num or sym.
    The TempleOS term is a U8.

    Standard ASCII values range from 0 to 127.  Values below 32 are ctrl key's.  So,
    an ASCII #3 is a <CTRL-c>.  TempleOS uses a few nonstandard values below 32.
    See Char Definitions.

    ASCII #5  is the cursor location in a saved file.
    ASCII #28 is <SHIFT-ESC>.
    ASCII #31 is a <SHIFT-SPACE>.

    TempleOS ASCII is 8-bit instead of 7-bit, so it also uses the range from
    128-255.  Press <CTRL-ALT-a> to see shapes for 128-255.  Technically, <CTRL-ALT-
    a> are scrn codes.

    A Key is typically specified with a scan code.  TempleOS scan codes contain the
    key value in the lowest U8, and flags in the upper 3 bytes.  See
    Scan Code Flags and Scan Codes.

    TempleOS stores scan codes in 8 bytes.
      Byte 0   is the code.  NumPad keys, SHIFT, ALT, CTRL and GUI keys combined.
      Byte 1-3 are flags

    The upper 4-bytes are copied from lower 4-bytes.
      Byte 4   is the code.  Left, Right and NumPad keys distinct.
      Byte 5-7 are flags

    Run the program ::/Demo/MsgLoop.HC to examine scan code.  Press <CTRL-SHIFT-l>
    and "Insert ASCII/ScanCode".

    See Key Allocations and CKbdStateGlbls.

    A String is a bunch of ASCII characters terminated with a zero.