POP3: see Post Office Protocol, version 3 mail server.
PTR record: see Pointer (PTR) record.
Pointer (PTR) record: A host name for reverse mapping (IP-address-to-host-name). The opposite is forward mapping, using a Host (A) record.
Post Office Protocol, version 3 (POP3) mail server: A common mail server used for Internet email. It holds the incoming email messages until you log in to the email account and download the messages. All stored email messages and attachments are downloaded at the same time.
Primary name server: The main Domain Name System (DNS) server that translates alphabetic domain names into numeric IP addresses.
Process Quota: The number of processes that can be simultaneously run by a user on a server. This number is based on the Service Level Agreement.
Property: A set of predefined configuration settings for a data group.
Protect Directories: A WEBppliance option that allows you to limit access to Web pages and data that resides on your server by using password protection.