Calendar Plugin token

[visaju]

I am wondering why the Link to calendar needs the generated token at the end of the url:
?_task=dummy&_action=plugin.calendar&_s=5e99d61f1cee68c83762f7ab88ee5c8c#
When i leave it out the calenedar still works. Why is it needed?

I would like to ommit it in my custom skin.

[rosali]

It is just a cache buster.