INT 21 U - DOS 3.1+ internal - SHARE.EXE - CLOSE FILE BY NAME
        AX = 5D02h
        DS:DX -> DOS parameter list (see AX=5D00h), only fields DX, DS,
                computer ID, and process ID used
        DPL's DS:DX -> ASCIZ name of file to close
Return: CF set on error
            AX = error code (see AH=59h)
        CF clear if successful
Notes:  error unless SHARE is loaded (calls [SysFileTable-28h]) (see AH=52h)
        name must be canonical fully-qualified, such as returned by AH=60h
SeeAlso: AX=5D04h,AH=3Eh,AH=60h