Lenovo ThinkPad X121e (English) User Guide - Page 28
Certificate of Authenticity label, Features, in Windows XP
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If no integrated wireless PCI Express Mini Card has been preinstalled in your computer, you can install one. To do this, follow the procedure in "Installing and replacing the PCI Express Mini Card for wireless LAN/WiMAX connection" on page 87 or "Installing and replacing the PCI Express Mini Card for wireless WAN connection" on page 91. Certificate of Authenticity label The Certificate of Authenticity label for the preinstalled operating system is attached. Printed on this label are the product ID and the product key information for your computer. Record this information and keep it in a safe place. You might need these numbers to start your computer or reinstall the operating system. Features Processor • See the system properties of your computer. You can do this as follows: Click Start, right-click Computer (in Windows XP, My Computer); then from the pull-down menu select Properties. Memory • Double data rate 3 synchronous dynamic random access memory (DDR3 SDRAM) 12 User Guide