Location of the kernel file; the root directory contains both the boot program and the file containing the kernel for the system. The name of this kernel file varies from one manufacturer's machine to another. You can search for it as;
$ls -l /boot/vmlinuz*
-rw-r-r- 1 root root 2359087 Sep 22 00:20 vmlinuz-2.4.26
In this example; Linux kernel is given, but a similar name can be found for the other variants of UNIX.