WAP/WTP
Wireless Transfer Protocol is the wireless version of HTTP, but is a de facto industry standard, and not governed by W3C
Uses a compressed binary code format, rather than the text-based format of HTTP and HTML
Using WTP a server recognises that the device is a mobile handset
Current version is 1.1, but 1.2 is under development
WAP is basically future-proof, and will accommodate evolving mobile and wireless technologies