Indicates that the interface or dispinterface represents the default
programmability interface, intended for use by macro languages.
A coclass may have at most two default
members. One represents the source interface or dispinterface, and the other
represents the sink interface or dispinterface. If the default
attribute is not specified for any member of the coclass or cotype, the first
source and sink members that do not have the restricted
attribute are treated as the defaults.
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