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Full Discussion: www-csli
Top Forums Web Development www-csli Post 302350930 by pludi on Sunday 6th of September 2009 01:36:24 PM
Old 09-06-2009
Short Answer: because they can

Long Answer: because the string 'www' does not identify the service provided. The 'name' of a site is just an alias for the IP of the computer serving the site. All transfer is done using the IP address. In order to find out what IP address belongs to which computer, the DNS network is queried, which maps the URL to an address, and one IP can serve more than one URLs. The identification of which service is used is done by the protocol part of the URL, eg http:// or ftp://, which the client application (eg. the browser) will translate to a certain port (eg. Port 80/TCP). Sites like freshmeat.net even do away with the 'www' part completely.
In larger installations the distinction using the URL is/was done to distinct between server for HTTP (www), FTP (ftp), or E-Mail (smtp/pop).
 

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REMCTL_CLOSE(3) 					     remctl Library Reference						   REMCTL_CLOSE(3)

NAME
remctl_close - Close a remctl connection and free the client object SYNOPSIS
#include <remctl.h> void remctl_close(struct remctl *r); DESCRIPTION
remctl_close() cleanly closes any connection to a remote server created via remctl_open() for the given client object and then frees the object created by remctl_new(). It should be called when the caller is finished with a remctl client object to avoid resource leaks. Following the call to remctl_close(), the r pointer to the remctl client object is no longer valid. remctl_close() is always successful, even if it is unable to send a clean protocol quit command to the remote server. SEE ALSO
remctl_new(3), remctl_open(3) The current version of the remctl library and complete details of the remctl protocol are available from its web page at <http://www.eyrie.org/~eagle/software/remctl/>. AUTHOR
Russ Allbery <rra@stanford.edu> COPYRIGHT AND LICENSE
Copyright 2007, 2009 The Board of Trustees of the Leland Stanford Junior University Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved. This file is offered as-is, without any warranty. 3.2 2012-06-19 REMCTL_CLOSE(3)
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