In emacs, when i am editing a program, and miss-input some command and make the cursor jump to somewhere in other files. Is there a short-cut key or command to jump back to the last location of the cursor?
You can use the command previous-buffer which in my version (GNU Emacs 23.2.1) is bound to
C-x left-arrow by default.
Just type Meta-x describe-key C-x left for further information
There is also winner-mode that binds
C-c left arrow to winner-undo which in short allows you to undo any change done to your windows.