For each table entry, if the matching tag is found in the tagList,
then the data in the structure will be placed in the memory pointed
to by the tags ti_Data.
Note: The value contained in ti_Data must be a *POINTER* to a
LONGWORD.
INPUTS
pack
Pointer to the memory area to be unpacked.
packTable
Table describing the unpacking operation.
See the include file <utility/pack.h> for
more information on this table.