Comment Re:Price (Score 5, Informative) 1264
On a more serious note, here's a document that (in great detail) describes the differences:
http://www.dwheeler.com/secure-programs/Secure-P ro grams-HOWTO/features.html
"First, the basics. Linux and Unix are fundamentally divided into two parts: the kernel and ``user space''. Most programs execute in user space (on top of the kernel). Linux supports the concept of ``kernel modules'', which is simply the ability to dynamically load code into the kernel, but note that it still has this fundamental division. Some other systems (such as the HURD) are ``microkernel'' based systems; they have a small kernel with more limited functionality, and a set of ``user'' programs that implement the lower-level functions traditionally implemented by the kernel."
http://www.dwheeler.com/secure-programs/Secure-
"First, the basics. Linux and Unix are fundamentally divided into two parts: the kernel and ``user space''. Most programs execute in user space (on top of the kernel). Linux supports the concept of ``kernel modules'', which is simply the ability to dynamically load code into the kernel, but note that it still has this fundamental division. Some other systems (such as the HURD) are ``microkernel'' based systems; they have a small kernel with more limited functionality, and a set of ``user'' programs that implement the lower-level functions traditionally implemented by the kernel."
