private static extern int NetSessionEnum(

    ''' The NetSessionEnum function provides information about sessions established on a server.

    ''' <param name="UncClientName">[in] Pointer to a string that specifies the name of the computer session for which information is to be returned. If this parameter is NULL, NetSessionEnum returns information for all computer sessions on the server.</param>

    ''' <param name="userName">[in] Pointer to a string that specifies the name of the user for which information is to be returned. If this parameter is NULL, NetSessionEnum returns information for all users.</param>

    Private Shared Function NetSessionEnum( _

                res = NetSessionEnum(server,null,null,502,out BufPtr,-1,ref er,ref tr,ref resume);

            success = NetSessionEnum(sServer, "", "", 502, bufptr, -1, EntriesRead, TotalRead, ResumeHandle)