Monitoring ISAPI works for:
•Native ISAPI extensions.
Native ISAPI
If you are working with native ISAPI you must use the NT Service API in your service as well as using the Monitor ISAPI method below.
To start monitoring ISAPI:
Launch menu
IIS menu
Monitor ISAPI...
shows the Monitor ISAPI dialog below
There is no toolbar or shortcut option.
Set the dll to monitor, the web root, the IIS process, an optional web browser to use and an optional url to launch, and click OK.

•ISAPI DLL
type or Browse to set the ISAPI DLL that we're monitoring
•IIS web
type or Browse to set the web root for the IIS website we're working with
•IIS process to monitor
select the IIS process we're working with
•Web Browser
select the web browser that you're going to use to load the web page
•URL to open in browser
type the web page and arguments you want to load to cause the ISAPI to be loaded in IIS
•OK
resets IIS, setups all the variables, copies DLLs and settings into the web root and starts the web browser to load the specified web page
IIS is a protected process and can only execute, read and write files in specific directories. That's why Bug Validator copies data to the web root so that it can be read, written or executed.