diff --git a/Common/ComData.h b/Common/ComData.h
new file mode 100644
index 0000000..09f62ce
--- /dev/null
+++ b/Common/ComData.h
@@ -0,0 +1,87 @@
+ #ifndef _COMDATA_H
+#define _COMDATA_H
+
+#if _MSC_VER > 1000
+#pragma once
+#endif // _MSC_VER > 1000
+
+
+#define CHAR_BUFFER_SIZE 255
+
+/////////////////////////////////////////////////////////////////////////////
+// CComData
+
+class CComData : public CObject
+{
+protected:
+	DECLARE_DYNCREATE(CComData)
+
+// Enumerator
+public:
+	enum eComData {
+		NONE = 0,
+		COM_SIGN_IN,
+		COM_SIGN_OUT,
+		COM_MESSAGE,
+		COM_CLOSE,
+		COM_CHECKALIVE, 
+		COM_SIGN_CHANGE,
+	//	------------------------------	
+		COM_ADD_CLIENT,
+		COM_REMOVE_CLIENT,
+		COM_PRIVATE_MESSAGE,
+	};
+	enum eBodyType {
+		BODY_NONE = 0,
+		BODY_MESU,
+		BODY_MEDO,
+	};
+
+// Attributes
+public:
+	UINT       m_ComDataType;
+	CString    m_FromID;
+	UINT       m_BodyType;
+	CString    m_StringBody;
+	CByteArray m_BArrayBody; 
+
+public:
+	void Initialize();
+
+	void SetBArrayBody( LPBYTE pData, int nSize );
+	LPBYTE GetBArrayBody();
+
+// Operations
+public:
+	CComData(); 
+	virtual ~CComData();
+
+// Overrides
+	// ClassWizard generated virtual function overrides
+	//{{AFX_VIRTUAL(CComData)
+	public:
+	virtual void Serialize(CArchive& ar);   // overridden for document i/o
+	protected:
+	//}}AFX_VIRTUAL
+
+	// Generated message map functions
+protected:
+	//{{AFX_MSG(CComData)
+		// NOTE - the ClassWizard will add and remove member functions here.
+	//}}AFX_MSG
+};
+
+//{{AFX_INSERT_LOCATION}}
+// Microsoft Visual C++ will insert additional declarations immediately before the previous line.
+
+#endif // _COMDATA_H
+
+struct sClientComInfos {
+	DWORD       pSocket;			// Socket ID.
+	CString     strID;              // Á¢¼Ó ID.
+	CString     szIPAddress;        // Á¢¼Ó IP.
+	UINT	    uPort;              // Á¢¼Ó Port.
+	CTime       TimeStarted;        // Á¢¼Ó ½Ã°¢.
+	
+	CStringList szMessagesList;     // ¼­¹ö°¡ ¼ö½ÅÇÑ µ¥ÀÌÅ͸¦ ¹®ÀÚ¿­·Î º¯È¯ÈÄ º¸°ü.(¿øº»Data¸¦ ÀڷᱸÁ¶ ±×´ë·Î ÆÄÀϷα׷Π³²±â´Â±â´ÉÀº Ãß°¡¿¹Á¤)
+};
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