Re: Multi-character constants

After reading through some (open) Intel (CPU detection)
C++ source (www.intel.com/cd/ids/developer/asmo-na/eng/276611.htm)
I stumbled upon a sketchy use of multibyte characters

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260:
        unsigned int VendorID[3] = {0, 0, 0};
        try // If CPUID instruction is supported
        {
         ...
        }
        catch (...)
        {
         ...
        }
        return (
                 (VendorID[0] == 'uneG') &&
                 (VendorID[1] == 'Ieni') &&
                 (VendorID[2] == 'letn')
               );

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This seems to work, gcc 4.2 emits a warning:

   "warning: multi-character character constant"

and Visual C++ 9 says nothing at all.

Whats the matter w/multibyte characters now?
I didn't use them and would be glad to learn
if they are widely implemented and part of
the standard soon/now?

gcc tells us:
(http://gcc.gnu.org/onlinedocs/gcc/Characters-implementation.html)
 ...
 [Characters]
 ...
 The value of a wide character constant containing more than
 one multibyte character, or containing a multibyte character
 or escape sequence not represented in the extended execution
 character set (C90 6.1.3.4, C99 6.4.4.4).
 ...