Operating System (OS)
Uniform Symbols Table

a permanent table which lists all key words and special symbols of the language in symbolic form
consists of a full or partial list of the token's as they appear in the program. Created by Lexical analysis and used for syntax analysis and interpretation
None of these
a permanent table of decision rules in the form of patterns for matching with the uniform symbol table to discover syntactic structure
contains all constants in the program

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Operating System (OS)
Feed back queue

are very easy to implement
dispatch tasks according to execution characteristics
None of these
require manual intervention to implement properly
are used to favor real-time tasks

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