What you need to do is, think current technology.

This is what you need.
1 Wireless Cable/ADSL Router (Gateway)
1 Compaq Ipaq PocketPC with imbeded Wireless 802.11b
1 Cable/ISDN/ASDL Internet link

OR
1 Wireless Cable/ADSL Router (Gateway)
1 Laptop with Wireless 802.11B
1 Cable/ISDN/ASDL Internet link

OR
1 Wireless Cable/ADSL Router (Gateway)
1 Sony Glasstron
1 Cyberpuck
1 Small portable computer without screen and with 802.11b
1 Cable/ISDN/ASDL Internet link

OR even
How about a net watch
http://www.i4u.com/section-viewarticle-28.html

OR even
How about a O2 XDA 2
http://www.o2.co.uk/xda/landing.html

Wayne