1. 
   Picture in picture
   TV display in which one picture is embedded in another picture.
   Found op http://www.agbnielsen.net/glossary/glossaryQ.asp?type=alpha&jump=none
   
   
2. 
   Picture in Picture
   (PIP) Displays a small picture from another source, such as a VCR. Enables you to check another source (e.g., football scores) while watching one channel or video.
   Found op http://www.sony.co.uk/glossary/ShowGlossary.action?site=odw_en_GB§ionty
   
   
3. 
   PICTURE IN PICTURE
   A television feature in which a small screen can be displayed within the large screen, allowing the viewer to watch (though not hear) two channels simultaneously. The second picture must usually be sourced through a VCR, although there are televisions with two tuners.
   Found op http://www.glossarycentral.com/plasma/picture_in_picture.html
   
   

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