# WMIEXTRA Test Page

This page allows you to test the three "extra" pieces of WMI functionality in the WMIEXTRA sample driver. I recommend that you have a DbgView window open (see www.sysinternals.com) so you can see the messages produced by the driver.

## Event signalling

Press this button to cause the driver to fire the wmiextra_event event:

wmiextra_event:

## Expensive data classes

Press this button to cause the driver to begin collecting the wmiextra_expensive statistics. Observe that the driver gets a FunctionControl call when you do this.

After pressing the above button, press this one to retrieve the statistic.

wmiextra_expensive:

Finally, press this button to stop collecting the wmiextra_expensive statistic:

## Function methods:

Enter a numeric argument for a call to the AnswerMethod in wmiextra_method, and then press the "Execute" button: