Are multibyte characters supported in DESelect?

Available in: DESelect Enable, DESelect Plus, DESelect Advanced

Yes, DESelect supports multibyte characters.

Multi-byte character sets are used to accommodate languages with scripts that have large numbers of characters and symbols, predominantly Asian languages such as Chinese, Japanese, and Korean. 

DESelect fully supports these character sets throughout the application. For a user working with multibyte characters in their Data Extensions, DESelect works in exactly the same way as a user using English in their Data extensions.