# open three file handles, for NT page, UNIX page, MAIL page
foreach my $class ( sort keys %classHash ) {
  foreach my $status ( sort keys %{$classHash{$class}} ) {
   if  ( $classname{$class} eq "NT"   ) ... # set output to NT page
   if  ( $classname{$class} eq "UNIX" ) ... # set output to UNIX page
   if  ( $classname{$class} eq "MAIL" ) ... # set output to MAIL page
   ...
  }
}