I didn't want to leave you out of my acknowledgements, but we wrote at the same time; so a special "thank you" to you, even because you've got me right!
What shall I take???
"accumulative" means that single things are collected (so their number grows)? This is not meant, although "accumulative" means some sort of "Sammel-"
"collective"? (Anne, who precised what I mean, says "no")
"central" seems to be a good solution, although I must admit that I'm not satisfied because of the little number of google hits.
OK, google does not know everything; but the german "Sammelstörung" or "Sammelstörmeldung" is very common and should have an english equivalent?
In this second I had the idea to google about it - and it helps:http://www.google.de/search?hl=de&ie=UTF-8&q=...
with LEO's archive:related discussion
Sorry for the useless work I gave to you, even to epl who answered in the meantime!