What is duplexing and is it a feature I need?

Can any printer be shared on a network? Can I connect an additional monitor to my laptop? Can I connect more than one monitor to my computer? Can I connect my older keyboard to my new PC? Can I convert a DVI port to a VGA port to connect my VGA monitor? Can I share my printer wirelessly with other devices in my home / office? Can I share my USB printer with other computers in my home/office? Can I share my USB printer with other computers on my network? Can I upgrade my laptop's CPU? Can I upgrade the hard disk drive in my laptop? Can I use a SATA 3 hard drive on a SATA 2 motherboard? Can I use an AMD graphics card on my Intel system? Can I use more than two mains networking adapters and do I have to use them in pairs? Can I use one monitor on two computers? Do I have to fit memory in pairs? Do you sell replacement power adapters for Laptops/Netbooks? Does my system need any special requirements to use a Solid State Drive (SSD)? How can I boost the range of my wireless network? How can I expand my wired network to allow for more wired devices? How can I improve my laptop/netbooks battery life? How can I increase the lifespan of my ink or toner? How can I tell if I require an ADSL or a cable router? How can I type the Euro symbol that is shown on number 4 on my keyboard? How do I open a command (aka 'cmd') prompt? How do I start my computer in safe mode? How do I stop my monitor from turning off after a certain period of time? How do I stop Windows from grouping all of my open Windows? I can't find the product code for Microsoft Office on my new PC. I didn't receive any installation or Windows disks with my laptop. I have a dead pixel on my monitor; can it be replaced under warranty? I have multimedia keys on my keyboard however they don't seem to function correctly? I'm looking at a monitor on your website which is listed as LED but then says LCD, is your description wrong? I'm replacing the power supply on my computer and the specifications state a 24 pin however my motherboard only has a 20 pin. I've connected my monitor by HDMI but I'm not getting any sound. I've entered my product key for Windows but it is telling me that it's incorrect. I've installed a 3TB drive but it's showing as 750GB or 2TB I've installed a new monitor and the graphics look distorted, squished or pixelated. I've just installed Windows on my new computer but it's not connecting to my network. I've just upgraded my computer's memory but my computer is showing less RAM usable than what I've installed (i.e. 8GB installed, but only 3.5GB usable). My new computer won't playback a DVD video. My optical drive (DVD, CDRW, Etc.) won't read or write media or is no longer visible in my computer but is shown in device manager. My wireless keyboard has stopped working, what can I do? Purchase Limitations The touch pad on my laptop has stopped working. The wireless on my laptop has stopped working. What are the primary differences between a Notebook and a Netbook? What does 'Network Ready' mean on a printers specifications? What does the K stand for at the end of an Intel CPU model number? What is a Blue Screen of Death (BSoD)? What is a mechanical keyboard and what are the benefits? What is a NAS (Network Attached Storage) Device and how do they work? What is an MFP? What is duplexing and is it a feature I need? What is Mains Networking? What is the difference between a Laptop and a Notebook? What is the difference between a Managed and an Unmanaged Switch? What is the difference between contrast ratio and dynamic contrast ratio? What's the best way to clean my keyboard safely? What's the difference between 2.4GHz and 5GHz Wireless? What's the difference between an Access Point and a Wireless Bridge? When I press the @ symbol on my keyboard I get the " symbol instead (or vice versa). Will a USB 2.0 device function on a USB 3.0 port? Will I invalidate my warranty if I upgrade my CCL built computer? Will my new printer come with ink? Will my old monitor work with my new computer? Will my printer come with everything I need to connect it to my PC?