[zone invocation restrict to campaign or client]

Thanks for all hints.
Sorry Erik but unfortunately Dave got my issiu. More or less I need a (pre-)filter applied on zones to select just banners with to a certain campaign or client. I know I could accomplish that by filters on banners too, but then every banner assigned to this zone that i dont want to show up needs some restrictions like: 
only show if  (Site variable) campaignid ist not set.

Or is there some other/better solution?

[zone invocation restrict to campaign or client]

Hi,

is it possible to restrict a zone to a campaign or client by invocation code.

something like

https://revive.myserver.net/www/delivery/ajs.php?zoneid=5&campaignid=22

I want to reuse this zone and not create for every campaign a new one

thanx for any advice