result = LibDoGadgetMethodA( Gadget, Window, Requester, Message )
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ULONG LibDoGadgetMethodA(
struct Gadget *,
struct Window *,
result = LibDoGadgetMethod( Gadget, Window, Requester, MethodID, ...)
ULONG LibDoGadgetMethod(
struct Gadget *,
struct Window *,
struct Requester *, ULONG, ... );