_IO_CLIENT_EXTENSION

Metadatacopy
struct _IO_CLIENT_EXTENSION {
    struct _IO_CLIENT_EXTENSION* NextExtension;/* 0x0  4 */
    void* ClientIdentificationAddress;/* 0x4  4 */
};
/* source: Windows 2000 RC2 DDK Alpha libcntpr.lib CodeView type records; build 2128 per the DDK's ntverp.h */