Here are the data structures with brief descriptions:

C_ENetAcknowledgement
C_ENetAddress	Portable internet address structure
C_ENetCallbacks
C_ENetChannel
C_ENetCompressor	An ENet packet compressor for compressing UDP packets before socket sends or receives
C_ENetEvent	An ENet event as returned by enet_host_service()
C_ENetHost	An ENet host for communicating with peers
C_ENetIncomingCommand
C_ENetList
C_ENetListNode
C_ENetOutgoingCommand
C_ENetPacket	ENet packet structure
C_ENetPeer	An ENet peer which data packets may be sent or received from
C_ENetProtocol
C_ENetProtocolAcknowledge
C_ENetProtocolBandwidthLimit
C_ENetProtocolCommandHeader
C_ENetProtocolConnect
C_ENetProtocolDisconnect
C_ENetProtocolHeader
C_ENetProtocolPing
C_ENetProtocolSendFragment
C_ENetProtocolSendReliable
C_ENetProtocolSendUnreliable
C_ENetProtocolSendUnsequenced
C_ENetProtocolThrottleConfigure
C_ENetProtocolVerifyConnect
CENetBuffer