QEMU has been installed, and kqemu compiled and configured, it should
be ready to run a guest OS from a virtual disc image. A disc image is a
file that represents the data on a hard disc. From the perspective of
the guest OS, it actually is a hard disc, and the guest OS can actually
create its own filesystem on the virtual disc.
You can download a few guest OS images from the QEMU website, including a simple 8MB image of a Linux distro. To run it, download and unzip the image in a folder and run the QEMU command.
with the name of your guest OS image file. If it has a GUI and you want
to use your mouse with it, double-click on the window and QEMU will
grab your mouse. To make QEMU release your mouse again, hold down the
Control and Alt keys simultaneously, then let go - your mouse will be
released back to X.