[ESS] A-M-r and A-M-s

[Rodney Sparapani]

Manuel Cebrian wrote:

>In the (official, posted on this page) ESS manual there are two key
>bindings A-M-r and A-M-s attached to two commands, commint-previous-
>matching-input and commint-next-matching-input respectively.
>
>¿Could anybody explain to me what is the 'A'? It becomes clear that the
>'M' key is the meta key and the 'C' key is the control key.
>
>Thank you in advance,
>
>Manuel Cebrian
>  
>
Hi Manuel:

It depends on your platform and keyboard.  On Unix and Windows,
A is most likely the Alt modifier.  On Mac, it can be either the
Option modifier or the Command modifier depending on your
emacs setup.

Rodney