WINSTATIONREMOTEADDRESS - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _WINSTA_H

// Retrieves the remote IP address of the terminal server client in the session.
typedef struct _WINSTATIONREMOTEADDRESS
{
    USHORT sin_family;
    union
    {
        struct
        {
            USHORT sin_port;
            ULONG sin_addr;
            UCHAR sin_zero[8];
        } ipv4;
        struct
        {
            USHORT sin6_port;
            ULONG sin6_flowinfo;
            USHORT sin6_addr[8];
            ULONG sin6_scope_id;
        } ipv6;
    };
} WINSTATIONREMOTEADDRESS, *PWINSTATIONREMOTEADDRESS;

#endif

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This type is documented in the [MS-TSTS] specification.