When I follow from one Org file to another via a link, the new file appears in alternative window if there is one. Is there a way to follow links staying in the same window?
For example, I use a frame with two horizontally split windows. Left is for code, right is for docs in Org format. If I follow a link in the right window, the new Org file is opened on the left side, and I do not see the buffer with a code anymore.
The behaviour for opening files is set in org-link-frame-setup.
By default, the behaviour for opening files is file-find-other-window.
The following two alternative commands will change that so that find-file is executed instead of find-file-other-window:
(setf (cdr (assoc 'file org-link-frame-setup)) 'find-file) (setf (cdr (rassoc 'find-file-other-window org-link-frame-setup)) 'find-file) 
C-x 4 C-o or C-x 5 C-o with the cursor on a link, respectively. This works for me:
(setq org-link-frame-setup '((vm . vm-visit-folder-other-frame) (vm-imap . vm-visit-imap-folder-other-frame) (gnus . org-gnus-no-new-news) (file . find-file) (wl . wl-other-frame))) The above code was automatically generated by Emacs when I customized the variable. I merely recast it using setq.
setq for it. setq because it helps me to better organize my configurations together.