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http://www.planet-source-code.com/ Step by step: open a socket, design an icmp packet, calculate checksums,….

http://www.pixelbeat.org/cmdline.html quick reference for common tasks, very good

http://www.bytemycode.com/ this code helps sure

http://particletree.com/features/a-designers-guide-to-prototyping-ajax/

http://httpd.apache.org/docs/2.0/vhosts/examples.html Several configuration examples about how to create virtual hosts: name based host on one ip, one several ips, running different sites in different ports, ip based virtual hosts,…

http://www-128.ibm.com/ Discover five common database problems that occur in PHP applications — including database schema design, database access, and the business logic code that uses the database — as well …