+On some systems, the chmod will not survive a reboot, and you will
+need to make edits to the udev configuration.
+
+
+vmchannel
+----------------------------------------------------------------------
+
+Previous versions of libguestfs required something called "vmchannel".
+Vmchannel is a special device given to virtual machines which allows
+them to communicate in some way with the host, often (but not always)
+without using a traditional network device. In reality, there is no
+one thing called "vmchannel". This idea has been reimplemented
+several times under the name vmchannel, and other hypervisors have
+their own incompatible implementation(s) too.
+
+In libguestfs <= 1.0.71, we required a specific vmchannel which is
+properly known as "guestfwd" and has been upstream in qemu since here:
+
+ http://lists.gnu.org/archive/html/qemu-devel/2009-02/msg01042.html
+
+In libguestfs >= 1.0.71 we don't require any vmchannel implementation,
+as long as qemu has been compiled with support for SLIRP (user mode
+networking, or "-net user"), which is almost always the case.
+
+In libguestfs >= 1.5.4 we switched again to using qemu's virtio-serial
+and removed all the other vmchannels and the SLIRP channel.
+
+
+Supermin appliance
+----------------------------------------------------------------------
+
+In libguestfs >= 1.7.19 the supermin appliance is the default and only
+supported form of appliance. For more information see febootstrap
+(http://people.redhat.com/~rjones/febootstrap/).