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<form action="myapp">
<input type="hidden" name="rm" value="save">
<input type="hidden" name="user" value="1">

sub edit {
    my $self = shift;
...
    my $user_id = $self->session->param( 'user' ); # retrieve it
    ...
}

sub display_form {
   ...
...
   # submission was ok, process the data
   ...
}