System Environment/Kernel
- kernel-2.4.21-53.EL: The Linux kernel (the core of the Linux operating system)
- kernel-smp-2.4.21-53.EL: The Linux kernel compiled for SMP machines.
- kernel-smp-unsupported-2.4.21-53.EL: An extra, unsupported, set of kernel modules
- kernel-unsupported-2.4.21-53.EL: An extra, unsupported, set of kernel modules