Glk
From IFWiki
An Application Programming Interface (API) for programs with textual user interfaces, created by Andrew Plotkin. Glk is not itself a programming language, nor is it a virtual machine; it merely defines an abstract mechanism to handle input and output. A full description of Glk is available at the author's website.
Glulx is a virtual machine that uses Glk and is designed for use in writing interactive fiction.
-- OKB
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