Some messages and events require a reply. The reply can be via the low-level interprocess communication mechanism, or indirectly via an IP_MsgInfo structure. This structure is filled by IP_Receive with enough information to facilitate a reply. Further, the message can be either a Cascade IPC message structure (IP_Msg), or it can be a raw binary buffer. In the case of a raw reply, it is the programmer's responsibility to ensure that the message is correctly formatted for the receiver. IP_MsgInfoReply is the normal means of replying.