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+One of the important features of a video recorder is the ability to deal with
+programme schedule changes and to ensure that the wanted programme is always
+recorded. TVAnytime has its own set of data descriptors to handle late-running
+or cancelled programmes but these are not used by Freeview Plus. Instead the
+Running Status from the now/next section of the EIT is used to start and stop
+the recording.
+
+VDR can control timers from the running status by using 'VPS' functions in
+conjunction with this patch. Note however that the normal VPS operation will no
+longer work.
+
+To use VPS for accurate recording, some conditions must be met:
+
+- VDR must be compiled with the 'VPS Fallback' patch (included with this
+  plugin). Note that some Linux distributions (eg. Mandriva) include this
+  patch in their binaries. 
+- Parameters 'UseVps' and 'VpsFallback' in setup.conf must both be set to 1
+- Timers must have the 'use VPS' flag set
+- The start time of a timer must be set to exactly the scheduled start time of
+  the programme (ie no padding).
+
+With these conditions met, the sequence of events is:
+
+- Shortly before the scheduled time of the recording (set by 'VpsMargin' in
+  VDR's setup.conf) VDR switches to the multiplex containing the channel to be
+  recorded
+- VDR monitors the running status of the programme to be recorded
+- When the running status changes to 'running', VDR starts recording
+- When the running status changes to 'not running', VDR stops recording and
+  deletes the timer.
+- If the programme has not started by the time it was scheduled to finish,
+  monitoring is stopped and the timer is deleted.
+
+CAUTION - VPS recordings seem to have a lower priority than live viewing. VDR
+will not interrupt live viewing to start looking for the start of a recording.