Microsoft Windows XP Professional :    the microsoft operating syste m certificate of authenticity is a multi-coloured label located on the side or bottom of your computer. 

 - Bonn :    Microsoft,    2002. 
 - 31 p. :    ill. ;    15 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Microsoft windows (Computers).<br/> Operating systems file (Computers).