UCS-2 vs. UTF-16?

[Guy Harris <guy () alum mit edu>]

Currently, we have separate encoding values for UCS-2 (Unicode code points between 0 and 65535, represented as 2-byte 
sequences) and UTF-16 (all of Unicode, with code points > 65535 represented as "surrogate pairs").

Is there any reason to support UCS-2 (in which, presumably, code points in the ranges 0xD800-0xDFFF would be treated as 
errors, as those code points are reserved as surrogates), or should we just support UTF-16?

The Microsoft [MS-RPCE] (Remote Procedure Call Protocol Extensions) specification talks about "Unicode" strings, 
without indicating whether that's full Unicode, encoded as UTF-16, or only the Unicode Basic Multilingual Plane, 
encoded as UCS-2.  I haven't checked what, for example, the SMB or SMB2 specification says.
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