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    <? prevnext "<h1>Flexible</h1>" ?>

    Tcl is an extremely flexible language.  It has to be, to work as
    an embedded language in the variety of environments in which it's
    deployed.
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<B><FONT COLOR="#A020F0">proc</FONT></B> <B><FONT COLOR="#0000FF">decr</FONT></B> {<FONT COLOR="#B8860B">varname</FONT>} {
    <B><FONT COLOR="#A020F0">uplevel</FONT></B> [<B><FONT COLOR="#A020F0">list</FONT></B> <B><FONT COLOR="#A020F0">incr</FONT></B> $<FONT COLOR="#B8860B">varname</FONT> -1]
}
<B><FONT COLOR="#A020F0">set</FONT></B> a 5
decr a
<B><FONT COLOR="#A020F0">puts</FONT></B> $<FONT COLOR="#B8860B">a</FONT></PRE>
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