Keyboard Page-up/down control ??

[rra]

Can anyone tell me what exactly should the keyboard
Page-Up and Page-down controls do (on a windows system).
It isn't mentioned in the help option.
It seems to go back/forward to previous or next selected
items, but it doesn't seem to be consequent doing so.

Ren?©

If this is true , is there a limit to the numbers of places/items it
remembers and is there a possibility to show (list) these places ??

[Christophe]

PageUp/PageDown allows navigation in the history which is a cel URL stack.

Each time Celestia's context changes (navigation mode, label/render mode, selection, etc...), the current cel URL is pushed on the stack.

The KDE interface makes this web browser metaphor a bit more obvious by providing back/forward buttons with history in the toolbar.