The CPC464 has two little known but useful features. The first is the counterpart of the BBC's DIV operator, represented by the '\' (the key above CTRL). For integer A and B, A\B returns the same result as INT(A/B), i.e. it returns the integer part of the quotient. If you get puzzling results check to see if you have used the correct symbol as both '\' and '/' are next to each other.
The other 'hidden extra' is CTRL-TAB which toggles between insert and overwrite mode. The latter overwrites text on the screen in the same way as the Commodore 64; the former shifts all the text along as you type.