It depends. If it is sitting on the side of the road, you can get it for free. You might get one that works for under $50 at thrift store, or someone may give you one. However, a couple of hundred isn't too bad if the machine is in good shape.
A used HP desktop computer can cost anywhere from $45 to $600 depending on where you get it from. The best place to buy a used HP desktop computer is at Radio Shack or online at Amazon's website.
I assume it is a database used on a local desktop computer.
Keystroke dynamics can be used to authenticate a user to a local desktop computer AS WELL AS to a Website.
DIMM
Google desktop consistently uses around 320M of RAM once installed which is a fairly high amount. Most computer users cannot spare that much memory all of the time.
A workstation.
The answer is Yes if you have a USB socket on your computer..I am currently using one on my desktop computer
a computer mouse
There is two types. There is DDR notebook RAM and there is DDR desktop ram. They can't be used vin each other (notebook RAM can't be used in a desktop) unless (in rare circumstances) you happen to have a notebook ram port on your desktop's motherboard. But no, DDR is a technology. Both desktops and notebooks support this technology because there is notebook DDR and desktop DDR. but notebook DDR can't be put in desktop DDR and vice versa.
Yes of course it has no differnece the same things work on a desktop or notebook same technology used.
The term computer is used for any personal computer you have whether it be desktop or laptop.
The type of RAM that a desktop computer uses depends upon the design of the specific motherboard that is installed in the computer. Refer to the specifications of the motherboard or of the computer manufacturer (i.e. Dell, HP) to determine the proper type of RAM for your computer.