Beej's Guide to Network Programming

http://beej.us/guide/bgnet/

HTML:

• One section per page (read online)
• All on one page (read online)

• One section per page (tarball for download)
• One section per page (zipfile for download)
• All on one page (tarball for download)
• All on one page (zipfile for download)

PDF:

• US Letter, one sided
• US Letter, two sided
• A4, one sided
• A4, two sided