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18.1 Introduction to UARTS. UARTs (U niversal A synchronous R eceiver T ransmitter) are serial chips on your PC motherboard (or on an internal modem card). The UART function may also be done on a chip that does other things as well. On older computers like many 486's, the chips were on the disk IO controller card.
UAC is a security feature of Windows Vista, Windows 7 and Windows 8 which helps prevent unauthorized changes to your computer. These changes can be initiated by applications, viruses or other users. User Account Control makes sure these changes are made only with approval from the administrator. If the changes are not approved by the administrator, they are not executed and Windows remains unchanged. It is as if nothing happened.