Hmmzz, I thought about adding them to the url, but I have a maximum of more than 100 variables........en it depends on what is added, because not every field is obligated to be filled out. Also, on some pages, you have the possibility to add a number of "things" all at once.
For instance: you're accommodation has 12 rooms, so you type in the field 12, en you get 12 fields with there own attributes.
Never the less, the idea of sessions sounds good to me, could you explain how this works???