Linux kernal vs Windows kernal

In Linux, you have more control over OS kernal level operations than in Windows. It is open source and free.
More info: http://linuxhelp.blogspot.com/2007/04/kernel-comparison-between-linux-2620.html

What is kernal in OS?
Kernal is the bridge between applications and system resources such as CPU, menory and devices.

http://en.wikipedia.org/wiki/Kernel_(computing)