If you want to switch run modes in mid-stream your current run mode just has to call the runmode that you want.

There is never any need for a normal CGI::Application based app to use redirect headers to access another runmode unless the resource has actually moved (e.g. has a new URL)

Here is larsen's example modified updated to remove the redirect.

# Does nothing except printing the form.
# Using sessions you can pass to it an error_message,
# for example.
#
sub login                                                             
+          
{   
    my $self = shift;                                                 
+          
    
    my $tmpl = $self->load_tmpl( 'login' );                           
+          
    
    return $tmpl->output();                                           
+          
}   

sub login_update                                                      
+          
{   
    my $self = shift;                                                 
+          
    my $q    = $self->query;
  
    # Fetch username and password from the form
    #  
    
    if ( PASSWORD CORRECT ) {        
        
        return $self->first_panel;           
    }
    else {

        # It could store some useful info in a session,
        # for example the error message.
        #
        return $self->login;
    }

    # You have a problem if this return ever actually executed
    #return;
}
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--
Clayton