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ISI Graphics Language
ISI Graphics Language (ISI-GL) is an early network protocol designed primarily for transferring graphical data between systems, often used in academic and research settings. It facilitates rendering commands and image data transfer over network connections, enabling remote visualization and graphical computing. Though largely obsolete today, understanding ISI-GL provides insight into the evolution of networked graphics protocols..
ISI Graphics Language (ISI-GL) was developed to enable the transmission of graphical display commands and vector-based images across networked computer systems. It originated at the Information Sciences Institute, supporting experimental remote visualization and interactive computing in the early stages of networked graphics.
Technically, ISI-GL operates over both TCP and UDP ports, allowing it flexible mode selection based on reliability versus latency requirements. It encapsulates graphical primitives and rendering commands, which receiving hosts interpret to display or manipulate graphical objects remotely. The protocol supports basic drawing instructions, user interface elements, and some real-time updates, intended for use over ARPANET and similar research networks.
Due to its vintage, ISI-GL lacks features such as encryption, authentication, or sophisticated error handling present in modern graphical protocols. It is mostly of academic interest or seen in legacy environments, having been superseded by established standards like X11, RDP, and VNC for remote graphics.