Trying to reset the html-files for the hotspot, I tried to use
"IP hotspot reset-html"

Then saw the output:
"numbers:"

After playing around, I found out, that entering "0" will do the trick.
However, what does this mean ?
Pls, advise.

Besides that, in
"Current html pages will be lost! Reset anyway? [y/N]:
looks a bit strange: to enter "y" or "N" (smalll, capital letter ?)

You can have N number of hotspots so it's asking which one to reset. If you had first done a command you would have seen numbers listed next to each (just the one in your case) hotspot defined. Try the command to see the interfaces listed with indices listed next to them. In commands you need to specify the target object with an index or a name.

Thanx for the info. Makes sense to me.
Should be entered into some of the official documents, from "Mikrotik", I guess.
Such missing info from the manuals does not increase the confidence in the documentation as a (w)hole.

And, as a hint to "Mikrotik":
In case, the coders do not like to explain the features and functions of their software in the written documentation, at least ask them for a "Self-explaining" user-interface.
The question "Number of Hotspot" would be a bit more informative ....

oh boy, i suggest reading the docs first, then complaining

http://wiki.mikrotik.com/wiki/Console#Item_Numbers

Besides that, in "Current html pages will be lost! Reset anyway? [y/N]:
looks a bit strange: to enter "y" or "N" (smalll, capital letter ?)

Presumably, 'n' is the default.

Nick.