Can any expert help me understand the need for the following members of CNode in src/net.h

std::deque<CSerializeData> vSendMsg;
std::deque<CInv> vRecvGetData;
std::deque<CNetMessage> vRecvMsg;

If I understand the source code correct, vRecvMsg is for storing the input messages and vSendMsg is a queue for output messages.

• Why do we have different form of queues [i.e. CNetMessage and CSerializeData] for input and output?
• What is the purpose of vRevGetData? Can you please help me understand also the concept behind the usage of this ?