[This is preliminary documentation and subject to change.]
A DISPID allows the implementation of IDispatch lookup the various methods and properties of a dual interface.
// PROPERTIES: Hierarchical
#define DISPID_ACC_PARENT (-5000)
#define DISPID_ACC_CHILDCOUNT (-5001)
#define DISPID_ACC_CHILD (-5002)
// PROPERTIES: Descriptional
#define DISPID_ACC_NAME (-5003)
#define DISPID_ACC_VALUE (-5004)
#define DISPID_ACC_DESCRIPTION (-5005)
#define DISPID_ACC_ROLE (-5006)
#define DISPID_ACC_STATE (-5007)
#define DISPID_ACC_HELP (-5008)
#define DISPID_ACC_HELPTOPIC (-5009)
#define DISPID_ACC_KEYBOARDSHORTCUT (-5010)
#define DISPID_ACC_FOCUS (-5011)
#define DISPID_ACC_SELECTION (-5012)
#define DISPID_ACC_DEFAULTACTION (-5013)
// METHODS
#define DISPID_ACC_SELECT (-5014)
#define DISPID_ACC_LOCATION (-5015)
#define DISPID_ACC_NAVIGATE (-5016)
#define DISPID_ACC_HITTEST (-5017)
#define DISPID_ACC_DODEFAULTACTION (-5018)