On fvwm, there's a pager showing the different windows on the different desktops, and usually the (beginning of the) title of the window is written on the little depiction of the window. But with Dillo, the depiction frequently had no title written on it. And I'd ignored this for a long time. Yesterday, I noticed that it had "O" when I was reading something with a window title of "Dillo: Chapter 7. I/O" and I'm like, "Slashes. It doesn't like slashes..." It seems that fvwm is displaying an "icon name". In Fl_Window::label(), if you don't set an icon name, it takes the label and runs it through fl_filename_name(name) for...some reason, thereby trimming everything up to the final slash. I just tried the attached patch, and the icon name was shown properly. Or maybe it should just be set to "Dillo" and left that way. I don't know whether there are any strong conventions here. Does your window mgr like to use the "icon name" at all?