Citando Bob Stern <[log in to unmask]>:

>> On Jul 11, 2013, at 7:36 AM, Knut S. Vikør <[log in to unmask]> wrote:
>>
>> Hold down the on-screen key for each letter a moment, and variants for that form will appear, slide the finger to the chosen letter and let go - e for é, c for ç, and so on.
>
>
> It also works on a Mac!  Instead of sliding your finger, you either 
> click the desired variant with your mouse or type its number before 
> releasing the original key.  Thanks!
>
> Bob Stern

Hi Knut Vikør & Bob Stern,

that's an obvious way show variants of a single keyboard key: I could
have found it out by myself... Sorry to worry you and many thanks,

Regards,

G. Beurlen
Rio de Janeiro Brazil