(20點)求程式,,我想要個程式可以見到發出左d咩信息等等

Wireshark (Monitor, but cannot change)

Wireshark is the world's foremost network protocol analyzer, and is the de facto (and often de jure) standard across many industries and educational institutions.

Wireshark development thrives thanks to the contributions of networking experts across the globe. It is the continuation of a project that started in 1998.
Features

Wireshark has a rich feature set which includes the following:

* Deep inspection of hundreds of protocols, with more being added all the time

* Live capture and offline analysis

* Standard three-pane packet browser

* Multi-platform: Runs on Windows, Linux, OS X, Solaris, FreeBSD, NetBSD, and many others

* Captured network data can be browsed via a GUI, or via the TTY-mode TShark utility

* The most powerful display filters in the industry

* Rich VoIP analysis

* Read/write many different capture file formats: tcpdump (libpcap), Catapult DCT2000, Cisco Secure IDS iplog, Microsoft Network Monitor, Network General Sniffer® (compressed and uncompressed), Sniffer® Pro, and NetXray®, Network Instruments Observer, Novell LANalyzer, RADCOM WAN/LAN Analyzer, Shomiti/Finisar Surveyor, Tektronix K12xx, Visual Networks Visual UpTime, WildPackets EtherPeek/TokenPeek/AiroPeek, and many others

* Capture files compressed with gzip can be decompressed on the fly

* Live data can be read from Ethernet, IEEE 802.11, PPP/HDLC, ATM, Bluetooth, USB, Token Ring, Frame Relay, FDDI, and others (depending on your platfrom)

* Decryption support for many protocols, including IPsec, ISAKMP, Kerberos, SNMPv3, SSL/TLS, WEP, and WPA/WPA2

* Coloring rules can be applied to the packet list for quick, intuitive analysis

* Output can be exported to XML, PostScript®, CSV, or plain text

有工具睇，你都要學識睇先得。電腦訊息傳送大多用 TCPIP 網路。這裡有好多免費的工具可以用（http://www.filetransit.com/freeware.php?name=Tcp_ip_Packet）
因為唔同訊息都有自己的溝通模式（Protocol）。如果你對 Protocol 不熟識好難睇得明，原因每一句訊息都會分開好多節來傳送。
除非你知道要看那一類程式的訊息，那時你可以用專屬的工具來看。如果你要修改；更加要知道 Protocol 的傳送順序和規則。
簡單的說，有工具，你都要學識基本的，先可以睇同改。
希望幫到你。