The COPYDATASTRUCT structure contains data to be passed to another application by the WM_COPYDATA message.
typedef struct tagCOPYDATASTRUCT { // cds
DWORD dwData;
DWORD cbData;
PVOID lpData;
} COPYDATASTRUCT;
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Requires version 1.0 or later.
Header: Declared in winuser.h.
Interprocess Communications Overview, Interprocess Communications Structures, WM_COPYDATA