Variable for external website

In our medical learning modules we call up an external website (wiki with glossary) to be shown in a lightbox. For this we use a  webobject on a hidden page. I am interested whether there is some experience about the primary string of the external address. Can there be a variable used that forms the beginning of the string, so in case of changing the address of the wiki, we do not have to change all the addresses on all the hidden webobjects pages ...

Would make it all easier and save a lot of work ...

Thanks for your help!

 

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