Need to write a service listener which could listen to external folder changes

Hi All,

I need to write a service listener which could listens to any change, either creation or modification of an object, which takes place on an external folder (OS folder). For example, I have a folder on the server (same on windchill) D:\input. If somebody creates an xml with WTPart name,number etx attribute, Windchill should listen to the new creation and creates a WTPart in Windchill. Similarly, even if someone modifies a file under D:\input, it shall trigger a request to create a WTPart. I'll think of the validation later, but I'm not aware of the events which I need to check for and how to read data on that.

Please help.

thanks,

Wasim