What Mention and explain three limitation of early counting devices?

Who uses the norton antivirus software? What allows a user to view further processing options when an application requires several related menus? Please explain what operating systems are and what is their significance? Is a mouse a monotreme? How do you uninstall original mouse driver from PC? What writes data and instructions in storage devices and performs calculations and other data processing? How many militers are in 6 liters? How can you keep your browser page from being hijacked? Shopping for Computer Stands? Why isn't disabling the Lsassexe process a good idea? What types of VPN does Windows 2000 and beyond work with natively? I notice on this computer is says "Hp Compaq" is this computer made like the good old Compaqs were I stopped looking for them when they were bought up by HP.? Where is a Replace button found in the computer? True or False When you create a new document the document automatically has two sections? What is the meaning of CD-r? When was the laptop computer created? How is wireless networking products conforming to the IEEE 802.11n specification achieve their increases in transmission speed? What is 600 ml added to 1.9 liters? Where is the sculpture of a warriors head produced? Is cameo a type of sculpting?