profile usernode pageroute

Hi

I realise this is a support question, but it raised no joy for me in the usual drupal forum, so I ask here because maybe there are more experienced people using Wolfgang's modules (or Wolfgang himself!)

ok question is.....

in the pagerouteUI admin pages there is an option "Preserve destination parameter during this route."

I assume this means the URL to be directed to at the end of the route?

How do I pass/specify this parameter, there seems to be nothing in the pageroute documentation.....

Thankyou

zz_james