The Linux kernel is the primary virtual machine; it is invoked by the service console. At normal run-time, the vmkernel is running on the bare computer, and the Linux-based service console runs as the first virtual machine. VMware dropped development of ESX at version 4.1, and now uses ESXi, which does not include a Linux kernel.
The definition of zen is slang for feeling peaceful and relaxed. An example of zen as an adjective is to have a zen experience, how you feel during a day at the spa. Zen is a type of Buddhism that focuses on awareness through the practice of meditation. An example of Zen is a rock garden that is tended to meditate.
Psycho is defined as someone or something that is crazy or insane. Stalking your ex-lover and killing his family pet is an example of behavior that would be described as psycho. The definition of a psycho is slang for a crazy or insane person. An obsessed stalker who threatens to kill his ex-lover is an example of someone who is psycho. Psycho is defined as mind or mental. An example of psycho used as a prefix is in the word psychology, which means the study of the mind.