I don't know why and how, but my background is being changed on my computer. I think it is done remotely, and I know it is my colleagues doing this. I have a freshly bought and installed MacBook Pro (2012 edition), fully up to date. I have password protection, I switch password every now and then (when being offline, so they can't sniff it). So I am pretty sure they don't know my password. I have an active Apache server, with PHP enabled and a MySQL database. The only way we are connected otherwise are through SVN (a version control for files and projects). How can they somehow upload an image and change my desktop background, most probably, remotely? Please help, I don't like the idea of them being able to control my Mac. Edit: Is there anything else you need to know to be able to help me?