USB Tuner - No Picture-in-Picture.

PVR/DVR Software for USB Tuner

I have a Winfast PalmTop TV (USB) tuner with me. Everything is working fine but the problem is I cannot get Picture-in-Picture (PIP) on that. The specifications states that this model does have PIP features. I use the WinfastPVR2 software which comes bundled with the tuner.

Any one knows how to enable this?

Also please do suggest alternative PVE software. I have used Intervideo WinPVR 3.
EDIT: ok I came to know that the tuner doesnot have two seperate tuners. The PIP features is just to watch recorded video ..