The same as any OS - up to 4GB for 32-bit systems, and 16EB for 64-bit systems.
Snow Leopard runs optimally on 2GB of RAM.
32 bit OS support max 2^32 bit = 4GB RAM
Based on its sheer configurability, a modern Linux kernel takes the cake by far. it is still possible to use a modern kernel with a basic userland in 4 MB of RAM.
knoppix could probably run on that, but it is primarily a live disk os, so it might have issues if you want to use it as a desktop or server
Yes, Linux is like an operating system much like Windows OS or Mac OS. Linux is kind of like a community of Operating Systems. A popular OS from Linux is Ubuntu.
Apple is more popular Linux is ok OS is Crap. There you go! You got an answer!
Android is a Linux OS
Ubuntu is a Linux distribution (as in a specific OS setup with the Linux kernel.)
Linux.
Most Linux OS's walk you through dual booting. Choose your prefered Linux OS and burn it to a disc and run it. You could also partition your hard drive from the XP side and create a space for your Linux OS to run in. If you are new to Linux, it is recomended to run the OS without actually installing it, that way you can get the feel of Linux without completely installing it.
LINUX and UNIX are vendor independent OS
nokia mobile supports windows OS and the sony erricission ,Motorola supports Linux OS.