Two problems about ndis?

Hi,everyone:
The first question:
I got some sourcecode "wlantest" to check the signal strength under
XP.But it failed to open the device by the following code:(my device is a
wireless adaptor with usb interface)
DeviceIoControl(m_handle, IOCTL_NDISUIO_OPEN_DEVICE,...)
error code is 170(The requested resource is in use).
But to my surprise,after I launched the netstumbler,it works.wlantest
runs successfully.Does anyone know why,and how can I revise the sourcecode
to run "wlantest" independent on Netstumbler.
The second question:
I have a wireless adaptor with usb interface connected to my PC.Can I
run the Pocket PC Emulater on PC to visit the adaptor.I had tried,but
failed.
I appreciate any reply.