An '''operating system''' is a program that facilitates the operation of a
computer.  It provides a platform which relieves other programs of the burden
of communicating directly with computer hardware, and an interface that allows
the user to interact with the hardware and to run other programs. 



** Common Operating System Families **

   [Unix]:   

   [Linux]:   

   [BSD]:   

   [Microsoft Windows]:   

   [Mac OS X]:   

[Tcl] has been ported to all of these systems.


** Facilities and Standards **

   [Filesystem Hierarchy Standard] :   

   [POSIX] :   a standard specification for [Unix]-like operating systems



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