This structure is used in the following IOCTL fns:
440cH 4aH (select code page)
440cH 6aH (query current code page)
DvRq 13H  (generic IOCTL for character devices)

IoctlCpIdRec
Offset Size Contents
                                                                          
+0     2  wLength      length of the rest of this structure (0002)
+2     2  wCpId        the code page number
4               length of an IoctlCpIdRec structure

See Also: fn 440cH (Generic IOCTL for character devices)
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IoctlCpIdRec