Post office protocol/ noun U [13] a message-retrieval pro used by many mail clients to get messages from a server. It only allows you to dowrload all messages in your mailbox at once and works in “pull” mode , i,e. the receiving PC initiating the connection.
Predicted frame / noun C [9] a type of image frame used in MPEG compression. A predicted frame only stores the differences in the image compared to the previous I frame or P frame.
Presentation layer / noun C [11] the part of a network communications system that ensures the message is transmitted in a language that the receiving computer can interpret
Primary disk drive / noun C [17] the main disk drive in a computer. In a PC this is usually a hard disk known as the C drive.