acters. Each command consists of a collection of fields separated by white space (spaces or tabs). The first field must be the name of a command, and the additional fields, if any, are arguments that will be passed to that command. For example, the command:</P>
<PRE>var a 22</PRE>
<P>
has three fields: the first, <CODE>
var</CODE>
, is the name of a Tcl command, and the last two, <CODE>
a</CODE>
 and <CODE>
22</CODE>
, will be passed as arguments to the <CODE>
var</CODE>
 command. The command name may refer