answer:Backslash is an important character, at least to hardcore PC users, and it used to be mandatory back in the days of DOS, so any keyboard that is missing them is incompletely marked and any keyboard config file that omits them is non-compliant. Look for the | (pipe) key and you will often find your backslash, just as the comma and period are usually your < and > whether they are marked thusly or not. There are all sorts of things that you don’t see on the keyboard that are actually there. Look for the ½ key, or the ¿.