 to a built-in Tcl command, an application specific command, or a command procedure defined with the built-in <CODE>
proc</CODE>
 command. Arguments are passed literally as text strings. Individual commands may interpret those strings in any fashion they wish. The <CODE>
var </CODE>
command, for example, will treat its first argument as the name of a variable and its second argument as a string value to assign to that variable. For other commands, arguments may be interpreted as integers, lists, file names,