Strange, your topic is already on google: http://www.google.com/#hl=en&source=hp&q=export+interfaces&aq=f&aqi=g-m1&aql=&oq=&gs_rfai=CaRQcTN8BTPL-LJDwMNHsvfsJAAAAqgQFT9CEe5I&fp=1a3caa30e0a876cf
As far as device drivers go, I'm not sure what an export interface is, I've never heard of it. Although, I'm most definitely lacking in the driver division of programming nowadays so I may be lacking in terms and knowledge as well. A quick google however proves that its not a common practice or term. I have, however, heard of an export driver if that's what you mean: http://www.microsoft.com/whdc/driver/tips/KmDLL.mspx - "What should you do?"
This is Windows specific though. Even I'm not sure where to begin on Linux although I think any of the many Linux IRC channels would love to get you started with more info than myself.