DBCS
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DBCS stands for "Double Byte Character Set". Some people use DBCS to mean Unicode, specifically UTF-16. While other people use the term DBCS to mean older (pre-Unicode) codepages that use more than one byte per character. Shift-JIS, GB2312 and Big5 are a few codepages that can contain more than one byte per character, but even using the term DBCS for these codepages is incorrect terminology because these codepage are really an MBCS (MultiByte Character Set). Some IBM mainframes do have true DBCS codepages, which contain only the double byte portion of a multibyte codepage.
If a business uses the term "DBCS enablement" for software internationalization, they are using ambiguous terminology. The business either means they want to write software for East Asian markets using older technology with codepages, or they are planning on using Unicode. Usually "Unicode enablement" means internationalizing software by using Unicode, and "DBCS enablement" means using incompatible codepages that exist between the various countries in East Asia for internationalizing software. Since Unicode supports all the major languages in East Asia, unlike many other codepages, it is generally easier to enable and maintain software that uses Unicode. DBCS enablement (non-Unicode enablement) is usually only desired when much older operating systems or applications do not support Unicode.