Basically, you can host as many full or sub-domains as you like under the one plan. Each domain (or sub-domain) will have its own web accessable directory, where you place the site files.
Each domain can also be placed under the control of a different user, so when that user logs in using FTP, they will see only the files relating to their domain.
By default, all domains are configured through the one Web admin panel. However, you can create new panel WebIDs (panel usernames) and give them certain panel privileges.
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