Unix uses the same memory as any other operating system. This includes either physical or virtual memory.
Most UNIX implementations use the same type of addressing as other modern Operating Systems, which include page translation, segmentation, and virtual memory addressing.
The memory is the function of the brain.
Vitual Memory
Yes, Unix is system software. It is a kind of operating system.
There is no traditional 'execute' command in Unix.
It is possible to use BSD software on Unix systems. It is possible but many do not and they use other softwares on Unix systems beside the BSD software.
You don't mention what kind of 'request'.
Your question is too vague; what kind of graphic and what do you intend to do with it? Either with svgalib or X11 (the latter is the good choice;)
It Depends what Kind Of Camera You Have
http://www.edgetechcorp.com/memory/upgrade.asp?cid=23155
A Unix memory dump is usually placed in a file called 'core'. You merely delete the file with the 'rm' command, as you would any other file on the system. For Linux/Unix on the mainframe, the file is called CEEDUMP (if the C plus plus runtime LE library is being used), and you delete it the same way.
In fact what you can use any kind of memory card, but you have to choose the best quality. I think wii memory card is very good. If you are interested in it, you may have a look. http://www.dinodirect.com/Wii-Accessories/Wii-Memory-Cards/