Many, if not most, codes are either country or continent specific, so a coupon code intended for use in the USA or North America would probably not work in Switzerland or Europe, however, this is not definite, since there are some coupon codes which work worldwide. HOWEVER, AWD numbers (see below) are WORLDWIDE, hence AWD = Avis Worldwide Discount number

Also, keep in mind, AWD numbers (begin with ONE letter, usually A, K, W, X) are corporate/association discount numbers (such as for IBM employees, Hilton customers, or National Association of Trial Lawyers members), and are totally different from COUPON codes (begin with three or more often FOUR letters, usually MUWA, MUAA, MUGA, TUWA).

AWD numbers, which are corporate or association PRE-NEGOTIATED rates, may be used together or without with COUPON codes (which are publicly available), and vice versa, ALTHOUGH, some AWD numbers are incompatible with some COUPON codes. Finally, most COUPON codes have expiration, or use before, dates.

YMMV and use this information at your own risk if you do not know what AWD numbers or coupon codes you are using!