| http://www.w3.org/ns/prov#value | - Most firewalls today, however, are implemented in software and require the computing resources of an entire desktop computer, making their use in a portable computing device such as cellular telephone or PDA very costly or impractical. [0006] Thus, there is a need for a firewall or packet filter that can be easily implemented in hardware in small size suitable for incorporation in small portable e
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