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+All commands start with a '\'.  The following commands are defined:

+ \help, \h, \?   - This help

+ \exit, \quit    - Exit the program

+ \radix          - Display the current radix (base)

+ \radix <num>    - Set the radix to anything between 2 and 36 (inclusive)

+ \scale          - Display the current scale

+ \scale <num>    - Set the current scale

+ \vars           - List all defined variables

+

+All variables must prefixed with a $ but otherwise can be used anywhere a

+number can be used.  To assign a variable use =, i.e.:

+  $amnt = $rate * 144000.09

+

+When using a radix greater than 10 all extended digits are lowercase letters

+starting with 'a'.  Upper case is not currently supported.

+

+All numeric command parameters (i.e. \scale, \radix) are in base 10 no

+matter what radix is currently set.  These are also displayed in base 10

+at all times.

+

+Changing the radix always clears all variables.