A good RSS reader. Nevertheless, I am confused about 1 aspect. When I want to mark all articles in a feed as read I use Shift+A while the feed in the left hand pane is selected. The number (whatever that means) on that feed disappears, but the articles remain shown as unread.

You can also double-click on the feed in the left hand pane. But if I do that, often there is still a number that remains shown for that feed, even though all articles in that feed are shown as "read".

I do not understand what the real difference between these 2 methods,