namespace facility, this variable controls
a &quot;backward-compatibility&quot; mode for widget access.
<P>
In vanilla Tcl/Tk, there is a single pool of commands, so the
access command for a widget is the same as the window name.
When a widget is created within a namespace, however, its access
command is installed in that namespace, and should be accessed
outside of the namespace using a qualified name.  For example,
<P>
<PRE>namespace foo {
    namespace bar {
        button .b -text &quot;Testing&quot;
  