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Indeed the X server is needed to run X clients (so-called "X programs"). But that doesn't mean you need a window manager. When I'm on command-line, and I want to start an X program fast without a window manager (eg: xcdroast), I do that:
Well... he also said "without launching the KDE or GNOME... because I am using low RAM".
I don't know how much RAM he has, but with my P150MMX laptop (32MB RAM), I often don't bother using virtual terminal anymore, since I use the Matchbox window manager, which is VERY lightweight, though probably not the lightest existing.
I think you might be confusing the terms X server with Window Manager.
You can run an X program without a windows manager.
You need to use a default init level of 3 of course.
Enter in the terminal
xinit /usr/bin/k3b -- :0
This will run the k3b program, and only the k3b program. You may need to install KDE so that you have the libraries installed. Such as the QT libraries for example. Some programs are pure X programs, like "xpdf" and only need x windows installed.
You may still run into a problem is the program uses a KDE subsystem like DCOP.