Identifies characters in the hexadecimal representation of a numeric value.

IdHexDigits: array [0..15] of Char  = '0123456789ABCDEF';

IdHexDigits is a constant array containing valid characters that can be used in the hexadecimal representation of a numeric value. IdHexDigits characters can be accessed by an index value that corresponds to the decimal value for the hexadecimal character.