[CONNECT C++] AccuDrawDemo magic numbers

SDK example AccuDrawDemo includes file adrwdmt.r.  That file is compiled by the Bentley resource compiler (i.e. it's not a C++ source file).  It contains some arcane data structures and some unexplained magic numbers …

#include <Mstn\MicroStation.r.h>
#include <RmgrTools\Tools\datadef.r.h>
#include <RmgrTools\Tools\cexprrsc.r.h>

// struct adrwdemoinfo is defined in adrwdemo.h
CexprName 0 = {"adrwdemoinfo"};
CexprName 1 = {"showAxes"};
CexprName 2 = {"useCPlane"};

CexprNamedStructures 1 =
    {{
    {0,  	0,	218519819},	/*  adrwdemoinfo  */
    }};

/*    struct adrwdemoinfo    */
CexprType 0 = {18,	8,	0,	0,	0};
CexprType 1 = {4,	4,	0,	65535,	0};

CexprMemberList 0 =
    {{
    {0x1, 	0,	1, 	0x2c006df5}, 	/*  showAxes  */
    {0x1, 	4,	2, 	0x7600db45}, 	/*  useCPlane  */
    }};

Can anyone provide enlightenment?