A basic understanding of keyboards and how they work around the world can help avoid problems in application development.
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On the US keyboard, there are two Alt keys; left and right. On most national keyboards there is a single alt key on the left, and an AltGr (Alternate Graphic) key on the right. This is the ISO9995 Group 3 non-locking shift.
In the French keyboard shown in Figure 2, the characters which can be entered using the AltGr are shown in the lower right corner. For instance, to input the Euro character (€) on the French keyboard layout you would press the E key while holding down the AltGr key. ISO9995 does not define a Shift-AltGr layer, but several of the Microsoft Windows keyboards and a number of de facto keyboard layouts are defined this way. The AltGr key assignment is normally engraved on the lower right quadrant of the key.
