| — Microkernel — Nanokernel — Exokernel — Virtual machine — System call• — Microkernel — Nanokernel — Exokernel — Virtual machine — System call• Real-time operating system — Time-sharing — — Embedded system — Single-user system — Multi-user system• and SMP — — Distributed computing• | Real-time operating system — Time-sharing — — Embedded system — Single-user system — Multi-user system• OS - Operating Systems bootable from a CD without need of hard disk installation |
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| and SMP — — Distributed computing• OS - Operating Systems bootable from a CD without need of hard disk installation |