CClient(void);
Constructor

void Initialize(char* playername, HWND hWnd, HINSTANCE hInst, GUID& appGUID, GUID& instGUID, DPIUserInterfaceResources& resIDs);
Does many things to intialize the client
1) Sets up direct play
2) Lets user select network connection type
3) Lets user choose to join a game/session
4) Awaits messages from server which passes any initial information back to the client after joining
This information includes playerID, direct play ID of the server, any server assigned           characteristics such as starting location.  This function will not return until all this information is received.

void SendNewObjectCreation(CNetworkableObject* pObject);
Call this function when a new object is created on the client due to user input.  For example when a player fires an arrow

void Tick();
Call this function once every game tick.
This function processes all updates form the server
It also sends to the server an update of the player object which will reflect any user input
 

The rest of this page details some of the internal implementation

VARIABLES:

DWORD serverID;
Stores the direct play ID of the server which is needed so that messages can be sent to the server

PLAYER_INFO playerInfo;
local copy of player information relating to ID numbers and player name

CDirectPlayInterface m_DPI;
Used to send and receive messages through direct play

DYNAMIC_CLIENT_MAP objectState;
Data structure storing any information about the game state that the client knows form the server
 
PRIVATE FUNCTIONS:

void HandleSystemMessage(DPMSG_GENERIC& message)
Handles any messages sent by direct play automatically such as joins, leaves or chats

void HandleObjectUpdate(CDataMessage& message);
Updates objects in game state  individually upon receiving this message from a server
This function also handles creation of object if it does not already exist in the game state

void SendPlayerObjectUpdate(void);
This function is called every tick to update the server about the current state of the player object.  This is how user input is propagated to the server

void ReceiveMessages();
Processes any relevant messages in the message queue
This function is called once every tick