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→Operators and Procedures: keywords
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Files and windows (mutable) allow Icon/Unicon to interface with the operating system. Operations on files and windows have side effects and they are considered mutable. Sockets and pipes are also implemented as "files".
=== Keywords ===
Icon and Unicon has a list of special variables known as keywords. Syntactically, keywords are variable names preceeded by an &..
Keywords can be used to inquire about the current state of the program, as constants, and to modify the operation (tracing and error control). For a list of keywords see [[Special_variables#Icon_and_Unicon]].
== Operators and Procedures ==
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