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In computer networking, a port or port number is a number assigned to uniquely identify a connection endpoint and to direct data to a specific service. At the software level, within an operating system , a port is a logical construct that identifies a specific process or a type of network service .
For publicly accessible services such as web and mail servers the port number is important. For example, port 443 connects through a socket to the web server software and port 465 to a mail server's SMTP daemon. [8] The IP address of a public server is also important, similar in global uniqueness to a postal address or telephone number.
Port numbers are categorized into three basic categories: well-known, registered, and dynamic or private. The well-known ports are assigned by the Internet Assigned Numbers Authority (IANA) and are typically used by system-level processes. Well-known applications running as servers and passively listening for connections typically use these ports.
A proxy server may reside on the user's local computer, or at any point between the user's computer and destination servers on the Internet. A proxy server that passes unmodified requests and responses is usually called a gateway or sometimes a tunneling proxy. A forward proxy is an Internet-facing proxy used to retrieve data from a wide range ...
Opler projected that fourth-generation computer systems would have a writable control store (a small specialized high-speed memory) into which microcode firmware would be loaded. Many software functions would be moved to microcode, and instruction sets could be customized, with different firmware loaded for different instruction sets.
Spring is a discontinued project in building an experimental microkernel-based object-oriented operating system (OS) developed at Sun Microsystems in the early 1990s. Using technology substantially similar to concepts developed in the Mach kernel, Spring concentrated on providing a richer programming environment supporting multiple inheritance and other features.
Medusa (Atari ST emulator), Fusion (Macintosh Emulator), AMax and AMax II, (Macintosh), GO64 (first Commodore C64 emulator), Transformer and PCTask (it was an Intel 8088 emulator, all software based, capable to emulate Intel PC based platforms ranging from PC XT 4,7 and 7 MHz on Amiga 500, up to 80486 running at 12 MHz on Amiga 4000 and other ...