Meta Data Services Programming
IParameterDef Description Property
This property is a string (of 255 characters maximum) that can be placed in an IDL file, providing a more meaningful description than that provided through the default text for the parameter type. This allows parameters of the type VT_DISPATCH to be defined, even though the IDL file contains text like "IRepositoryObject *".
Dispatch Identifier: DISPID_ParDefDesc (105)
Property Data Type: string