When you design application programs to process
double-byte data or convert alphanumeric application programs to double-byte
programs, consider this information.
Designing DBCS application programs
You can design your application programs for
processing double-byte data in the same way you design application programs
for processing alphanumeric data, with some additional considerations.
Converting alphanumeric programs to process DBCS data
If an alphanumeric application program uses externally
described display files, you can change that application program
to a double-byte application program by changing only the files.