names of meta and alt keys?

i want to implement menu accelerators on alt if both alt and meta exist. many people under x [e.g. hrvoje] have asked for this and it should be completely safe. but i need to know what the names of the alt and meta keys are for various keyboards ... please let me know. -- Ben In order to save my hands, I am cutting back on my mail. I also write as succinctly as possible -- please don't be offended. If you send me mail, you _will_ get a response, but please be patient, especially for XEmacs-related mail. If you need an immediate response and it is not apparent in your message, please say so. Thanks for your understanding. See also http://www.666.com/ben/chronic-pain/