Spiders & ISAPI Rewrite

[USCountytrader]

I have a website on a ISS server using ISAPI_Rewrite. My question is..I am very new to this. How do I prevent spiders from crawling that are not Google, MSN or Yahoo? Including any bots spoofing as these Spiders.

[wilderness]

Here's a very old thread that may help:
[webmasterworld.com...]