This function is similar to LVCA_DisplayMessage. LVCA_SystemMessage does not require a call handle.
LVCA_API BOOL WINAPI LVCA_SystemMessageA(LPCSTR Message);
LVCA_API BOOL WINAPI LVCA_SystemMessageA(LPCWSTR Message);
If successful, LVCA_DisplayMessage returns true. If false is returned, call LVCA_GetLastCallError to retrieve the error code and message.
ANY
Message (IN) Buffer containing the message to display in the call engine System Messages window.
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