I have spent a day playing with the above and found the following problems: The IPAQ will talk to the WPC PCMCIA card (fitted in a Sony laptop) but only of both are configured in ad-hoc mode. The WPC will talk to the WRT router but only if the WPC is configured to infrastructure mode. The router itself has no config for ad-hoc mode. The IPAQ will not talk to the WRT at all. (**) We have tried it straight out of the box, with no encryption, with 64-bit WEP, 128-bit WEP and nothing makes much difference. We can get the laptop entering the WRT config (IE6 opening 192.168.1.1) via the wifi port (the laptop has no ethernet port) The best I managed was connecting another PC to one of the WRT's ethernet ports (via a Linksys SD216 ethernet switch), opening IE6 on 192.168.1.1, and opening the WRT config on that PC, and also this PC and the Sony laptop seeing each other via network neighbourhood. But no luck with the IPAQ. (**)Just once or twice in the whole day we got all 3 (WRT, WPC, IPAQ) to appear together in the Linksys WPC config/diagnostic software but that was it. It happened with the channel set to 10. The whole wifi connection, even between the Linksys products, seems to be pretty unreliable at the best of times. I also tried a different approach which I have used at both home and office with Cisco 803 routers for years: set the router's ethernet IP to a fixed value, set each PC's IP to a fixed value, and on each PC set the router's IP as the gateway IP. DHCP disabled on all devices. This is a perfectly reasonable setup for an office where a number of PCs access the internet via a router, and with the fixed IPs you always know where you are. Has the WRT/WPC ever been tested with fixed IPs ("use the following IP address" under TCP/IP Properties under Networking in Control Panel)? But it didn't help, though I did find something odd: if one changes the WRT's IP to e.g. 10.105.100.254 one can access its config on that IP OK (instead of on 192.168.1.1) but ONLY if DHCP is enabled on the WRT. If you disable DHCP on the WRT you cannot enter its config at all. (if DHCP is enabled on the router then the PC used for configuring it cannot have a fixed IP) I wonder if somebody has hard-coded the 192.168 ... IP in a few places, and I wonder if the WRT router has ever been tested with DHCP disabled. These items have been recently bought but perhaps everything needs a firmware upgrade??? Can anyone suggest anything?