Hex, octal, and ASCII radix notation can be used to specify numeric literal values, i.e.:
&h100 ! hex 100 (256 decimal)
&o100 ! octal 100 (64 decimal)
'A' ! ascii A (65 decimal)
These can be used in expressions where you would otherwise be able to use numeric literal values.
As of A-Shell build 1175 of February 2010, octal and hex values are supported in DATA statements.