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Explain: Linux and UNIX TCP Wrappers – Find Out If a Program Is Compiled With TCP Wrappers

What are TCP Wrappers? How do I find out if a program or server (service) is compiled with TCP Wrappers? What are the advantages and disadvantages of TCP Wrappers over firewalls like Netfilter or PF? How do I protect my Mac OS X or Sun Solaris or Linux workstation by using TCP Wrappers?
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Restrict SSH Access Using tcpd (TCPWrapper) on Linux or Unix

How do I use tcpd on a Linux to restrict ssh access?
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