The OLESERVER structure is defined in the header file, OLE.H. lpvtbl in the OLESERVER structure points to a table of function pointers for the server application. This structure is initialized and maintained by the server application for OLESVR.DLL.
OLE.H defines the OLESERVER data structure as follows:
typedef struct _OLESERVER
{
LPOLESERVERVTBL lpvtbl;
} OLESERVER;