What keyboard do you use? There is already an AltGr key on most keyboards.

DominoTree · on Sept 24, 2017

I haven't seen an AltGr key on a keyboard in the US in at least 15 years.

kps · on Sept 24, 2017

At the USB HID level, AltGr is merely the right Alt key; the interpretation is just host software.

If a keyboard physically has two keys labelled ‘Alt’ and two labelled ‘AltGr’, then at the protocol level both ‘Alt’s are (indistinguishably) USB LeftAlt and both ‘AltGr’s are USB RightAlt.

(Mac keyboards' ‘Option’ is the label for USB Alt and acts like Windows' AltGr.)

buckminster · on Sept 24, 2017

Apart from the label, AltGr is identical to right hand Alt. The difference is all in software. For example, if you tell your computer you have a UK keyboard it will treat right hand Alt as AltGr.

pjmlp · on Sept 24, 2017

In Europe most PC shops still sell them.

rakete · on Sept 25, 2017

German Keyboard. Yes, there is an AltGr key on my keyboard but I map that one to Control actually...

In fact I swap my Alt and Control keys, and don't use AltGr for its original intent at all, because using AltGr+7/8/9/0 on the German keyboard to type {[]} is horrible. I use an english layout (which I modified with my AltGr+j/k/l/i thing and a bunch of other tweaks) instead.