The header for every structure passed to the GetRtServiceAttributes and SetRtServiceAttributes.
Each service implements 0 or more of these structures as required to modify certain operational fields of that service.
Note: More fields may be added as required to each structure.
typedef struct tagServiceAttributes {
    WORD wOpCode;
    WORD wLength;
} SERVICEATTRIBUTES, *LPSERVICEATTRIBUTES;
wOpCode 
wLength 
GetRtServiceAttributes, SetRtServiceAttributes