The [downlevel] command (currently available in [Eagle] only), is used to evaluate a script in the
variable context that existed just prior to the previous [uplevel] command.

Example:

    proc deepdown {} {
      lappend a 1
      uplevel 1 {
        lappend a 2
        downlevel {
          lappend a 3
          uplevel #0 {
            lappend a 4
            downlevel {
              lappend a 5
            }
          }
        }
      }
      return $a
    }

    deepdown; # returns 1 3 5

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