Hi Folks of the Flickr Fraternity.

I am considering becoming an acolyte of this august body, but I have one question (or more).

Can I make the individual images, whether in the photostream or in an album, all hidden?

Alternatively, can I give a link, say here in AP, so that ONLY that image can be seen and not all the others, in albums or stream?

Another take:
From such a link I want to be sure that nobody can migrate away (upwards, across) to any other pictures.

Or even:
Sometimes I get a message when I click on a Flickr link something like: "You must be signed in to see this image."

Can anyone who is signed in to Flickr see that image, or does it only refer to the user whose image it is?

(Hmm! This was as clear as mud before0)
Ta, Am.