Help for VHOST:

VHOST allows operators to set a virtual host (also
known as a spoof or cloak) on an account. This vhost
will be set on the user immediately and each time
they identify. If no vhost is specified, clear any
existing vhost.

Syntax: VHOST <nickname> [<vhost>]

Examples:
    /msg &nick& VHOST spb may.explode.on.impact
    /msg &nick& VHOST nenolod