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+======Syntax of the ircII language:======
+The ircII language is organized into //blocks//.
+A //block// is a sequence of //statements// separated by semicolons.
+A //statement// is one of the following
+  * A //command statement//
+  * An //expression statement//
+  * A //block statement//
+A //command statement// is of the form
+    command arguments
+The //command// is separated from the //arguments// by a [[space character]].
+The //command// is either an [[alias command|alias]] or a //built-in command//.
+A //expression statement// is of the form
+    @expression
+or
+    (expression)
+The [[expressions|expression]] is evaluated, but it's return value is ignored.
+A //block statement// is of the form
+    { block }
+which allows you to nest [[block]]s anywhere you need them.
+=====Expando substitution:=====
+All //command statements// undergo expando-substitution ($'s are expanded)
+before the //command// is separated from the //arguments//.  This is a
+deliberate feature that allows you to use variables as commands.  This
+expansion is global over the entire statement and occurs regardless of
+what the command actually ends up being.  There is no way to override this
+on a command-by-command basis.
+//Expression statements// do not undergo expando-substitution, although
+some operators do permit expandos to be operands.  Those expandos are
+expanded on a case-by-case basis by the expression parser.
+//Block statements// never undergo expando-substitution, although any
+//command statements// contained within will be as they are executed.

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