Colorful Hotkeys lead you further into site

Bubble grey Hotkeys lead you out of the site (watch how many times back)

At a specific Collection level, Green Framed images indicates a Hotkey to a larger version

A Green Framed larger version has an image number and letter codes

Letter codes are: 'D' - digital; 'F' - film/film based print from negative
First letter is the image capture mode (Film based camera or a Digital camera)
Second letter is print type (computer generated injet or film based print enlargment in a (my) traditional darkroom)

After following a Green Framed image, a Red Bubble next to the enlarged image leads you back