When you configure or reconfigure an ESX/ESXi host, you usually do not use the methods in HostSystem directly, but work with managed objects available for configuration of that part of the system. For example,
HostNetworkSystem allows you to configure the network, and
HostAuthorizationManager is for managing users, groups, and permissions on a host. The objects and related methods are discussed in the corresponding chapters of this guide.
Some methods are defined locally in HostSystem. See the
vSphere API Reference for details on each method.