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B.5 Support requests
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B.6 Web server administration
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B.7 Asking permission for things
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B.8 Mirroring the PuTTY web site
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B.9 Praise and compliments
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B.10 E-mail address
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Appendix C: PuTTY Licence
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Appendix D: PuTTY hacking guide
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D.1 Cross-OS portability
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D.2 Multiple backends treated equally
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D.3 Multiple sessions per process on some platforms
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D.4 C, not C++
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D.5 Security-conscious coding
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D.6 Independence of specific compiler
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D.7 Small code size
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D.8 Single-threaded code
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D.9 Keystrokes sent to the server wherever possible
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D.10 640×480 friendliness in configuration panels
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D.11 Automatically generated Makefiles
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D.12 Coroutines in ssh.c
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D.13 Single compilation of each source file
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D.14 Do as we say, not as we do
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Appendix E: PuTTY download keys and signatures
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E.1 Public keys
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E.2 Security details
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E.3 Key rollover
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Appendix F: SSH-2 names specified for PuTTY
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F.1 Connection protocol channel request names
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F.2 Key exchange method names
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F.3 Encryption algorithm names
Chapter 1: Introduction to PuTTY
PuTTY is a free SSH, Telnet and Rlogin client for 32-bit Windows systems.
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1.1 What are SSH, Telnet and Rlogin?
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1.2 How do SSH, Telnet and Rlogin differ?
1.1 What are SSH, Telnet and Rlogin?
If you already know what SSH, Telnet and Rlogin are, you can safely skip on to the next section.
SSH, Telnet and Rlogin are three ways of doing the same thing: logging in to a multi-user computer from another computer, over a network.
Multi-user operating systems, such as Unix and VMS, usually present a command-line interface to the user, much like the ‘Command Prompt’ or ‘MS-DOS Prompt’ in Windows. The system prints a prompt, and you type commands which the system will obey.
Using this type of interface, there is no need for you to be sitting at the same machine you are typing commands to. The commands, and responses, can be sent over a network, so you can sit at one computer and give commands to another one, or even to more than one.
SSH, Telnet and Rlogin are network protocols that allow you to do this. On the computer you sit at, you run a client, which makes a network connection to the other computer (the server). The network connection carries your keystrokes and commands from the client to the server, and carries the server's responses back to you.