How can I type "\" (backslash) via remote desktop with a Norwegian, Danish or Swedish keyboard?

I am running Remote Desktop to connect from my MacBook Air with Yosemite to a Windows computer running Windows 8.1.

Both my Mac and the Windows computer is configured with Norwegian keyboard layout. It seems "\" backslash is impossible to input in this keyboard configuration. I would guess it's the same for Danish and Swedish keyboards.

Is there a way to easily input this character in RDP for Mac using this keyboard layout?

(I would be willing to map some key combination if that's possible, but I don't want to switch to some other keyboard layout, since I need to input Norwegian characters now and then)