Why are .#<filename> files appearing whenever I edit a file

Say I'm editing file.txt. Before saving this file, a new file appears named .#file.txt. This file is a symlink pointing elsewhere on my machine.

I have read about Emacs auto-save and backup files. From my understanding, auto-save files take the form of #filename# while backup files take the form filename~.

I have disabled both auto-save and backup to learn more about this annoyance. I configured these with the following lines:

(setq auto-save-default nil)
(setq make-backup-files nil)

Unfortunately the problem even after this configuration. Does anyone know what is causing the creation of the .#file.txt file? Could it be a lock file?

Solution

From the EmacsWiki AutoSave

Be aware that symbolic links of the form “.#*” are not auto-save files but interlocks to prevent the simultaneous editing of the same file. See Interlocking in the EmacsManual for details.

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