[X4U] iCal in Leopard question

[Simon Forster]

Hi Folks

I wonder if someone can throw any light on a question for me? Leopard:  
iCal: One of my calendars. It displays a number 1 in a grey oval  
beside the calendar name in the left hand column. Similarly, iCal's  
dock icon has a 1 in a red star. This is analogous to the numbers  
which appear in Mail when one has unread mail waiting. However, I  
don't understand what the number in iCal refers to. Obviously it's  
blindingly obvious - except it isn't to me.

Any ideas why this is present and how I can nuke it?

TIA

Simon Forster
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