windows_host_ip_address:0.0 not a valid id on remote host

[claude]

Cygwin/XFree86 User's Guide at Displaying Remote Clients says:

5. In your telnet session type, DISPLAY=windows_host_ip_address:0.0
6. In your telnet session type, export DISPLAY

This doesn't work. On an OpenBSD 2.8, bash, it will say:
export: `192.168.1.8:0.0': not a valid identifier

Any ideas on how to make this work ?