[O] Clock-in task when emacs starts

[Radosław Grzanka]

Hello,
  is it possible to select and clock-in default task when emacs starts?
I'm trying to implement GTD setup as described here 
http://doc.norang.ca/org-mode.html and I like concept of "punching-in". 
However, I found out it is not necessary for me to select "default task" 
each time I punch in becaue I have only one such task.

Therefore, I'd like to set default task and clock it in when emacs starts.

Any help?

 Thanks,
  Radek.