only one window

hi guys… i’m new to blender… and i think i pressed somerhing wrong while doing some work… but there is only one window displayed for a certain file… all the other files have got the separator but this one doesn’t… please help… here is a pic to show what i mean…


just press ctrl+arrow up (whatewer this key name is… :rolleyes:)

Or Shift+Space. Does the same thing, but can be done only with left hand :).