KTT working area consist of two panes — Roman pane on the left and Tengwar pane on the right.
The green LED marks the active pane — Edit menu items applies to the active pane only. The yellow LED is a modification mark — if text in the pane is modified, yellow LED below that pane is on.
The status bar contains some processing informations and info about loaded mode — filename, case information and author comments.
More KTT screenshots can be found on the KTT homepage.