I’ve been working in Dreamweaver CS4 on two computers, bot by accessing my hosting server (Bluehost) via the FTP feature in DW. Whenever I need to edit a file, I double click the file on my server in the Files Manager and it opens it with the submenu directly under the file name. Here’s the example:

The issue I am having is when I edit includeA.php (which is included in PageA.php) on Computer1 and then go home to edit PageA.php on Computer2. I then save, which then saves over my changes made to includeA.php from Computer1.
Essentially, Is there any way to automatically update included files when opening a file? Or even when I start DW, updating all of my files in a certain directory? I believe I have tried refreshing my working directory before I edited includeA.php, but that did not help…I think… I have set up a test for this and will be testing by my return here (Computer2) tomorrow.
Any ideas? Thanks all!
Maybe you want to use a revision control system that solves your problems. git?