Controlling a W7 desktop using a W8.1 tablet (Teamviewer)

I have a Dell Venue 8 Pro.

Teamviewer works perfectly and I see my remote screen just fine.

There is only a small detail that ruins my experience.

How can I send that damn "Windows/Start key" to the remote computer? It is not on any of my tablet keyboards either!

Running TV, in the header, I see "Actions" and even CTRL+ALT+DEL but nothing to do that simple task.

Can it be triggered through any combination of key? 

I tried the metro version Teamviewer Touch but found no solution.

I must be missing something really simple.