POP
1. From the stack (STACK) data moves out .2. POST OFFICE PROTOCOL of a side is used to allow users to e-mail program (E-MAIL) from the mail server (E-MAIL SERVER) to read e-mail protocol. POP There are two specifications, POP2 send mail using SMTP agreement, POP3 e-mail can be sent directly .3. POINT OF PRESENCE telephone dial-up (DIAL-UP) service points, such as every ISP has a number of POP for the user to call Dial-up.

Portal Web Site
That can provide a variety of content and services to the website (WEB SITE), the main objective is to become the user's browser (BROWSER) start page.

POST Power-On Self Test
PC boot BIOS settings based on the implementation of the self-test.

POTS Plain Old Telephone Service
The most popular means of connecting to the Internet or a remote network might still be the good old telephone line and modem.
Internet access through a phone system requires two things: a modem and a dial-up access account through an ISP. Modems are devices that convert the digital signals generated by a computer system into analog signals that can travel across a phone line. A computer can have either an internal or external modem. External modems tend to be less problematic to install and troubleshoot because they don't require reconfiguration of the host system. Internal modems use one of the serial port assignments (that is, a COM port) and must therefore be configured not to conflict with other devices.