NOTE: These screenshots show the old Tk interface. All features displayed here are implemented in the new GTK interface, but the look and feel have changed, of course.
Bantam on my 1024x768 desktop:
It starts with one panel:
Press [P] to open and go to a new directory panel ...
... then [v] to view the contents of a file ...
... or [e] to edit the file:
Two panels not enough? Open as many as you need.
Tooltips display full paths when they are too wide to fit in the labels.