use DXDebug;
use strict;
-use vars qw(%u $dbm $filename %valid);
+use vars qw(%u $dbm $filename %valid $lastoperinterval);
%u = ();
$dbm = undef;
$filename = undef;
+$lastoperinterval = 30*24*60*60;
# hash of valid elements and a simple prompt
%valid = (