Kde: how to bind permanently an application to a desktop/activity?

Im pretty new to Kde 4.8 and I can not figure out how to get this behaviour that I used to have in Gnome: 1. Desktop 1: developer/misc (browser, editor/ide, diff, etc..) 2. Desktop 2: virtual machines (vbox) 3. Desktop 3: graphic (gimp, inkscape, phatch) 4. Desktop 4: file management (ftp, ssh, etc..) In gnome is possible to configure the windows to **always** appear in a specific desktop, and this is what I want to achieve in Kde. I googled around so much, and looks like activities can't do that (yet), becose using the window's menu only works for the current session, and get lost after reboot. By the way, I suppose that activities *can* do that, becose in the default activities that come with Kde 4.8 Gimp used to show only in the *photo* activity (I gave a look to the activity configuration but I didn't find anything about this behavior). Onestly, my goal is to obtain this scenario, if it is not possible with activities but with desktops, for me is ok. So, any idea on how to obtain this behavior in Kde 4.8? I already read this similar question , but im looking for a _permanent_ solution.