#define IDH_Introduction 0
#define IDH_Basement 1000
#define IDH_DesignTime 2000
#define IDH_FileFormats 3000
#define IDH_Geometry 4000
#define IDH_Physics 5000
#define IDH_Scripting 6000
#define IDH_Shaders 7000
#define IDH_Sounds 8000
#define IDH_Help 9000
#define IDH_HelpContents 9001
#define IDH_HelpGlossary 9002
#define IDH_HelpAbout 9009