merge canvas prints to one file

From: Robert Loke (loke@ifh.de)
Date: Tue Oct 14 1997 - 11:44:24 MEST 

Hi,

is there a chance to merge the saved content of several canvases in one
file?

If there's only on canvas to be saved, it's easy using canvas.Print(...).
But calling this twice (or even more often), the previous content becomes
overwritten. 
Is there an option for appending the next plot to this file?

Thank you, Robert

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+     Robert Loke                                         +
+     Humboldt University Berlin                          +
+     Invalidenstr. 110                                   +
+     10115 Berlin                                        +
+     Germany                                             +
+                                                         +
+     e-mail : loke@ifh.de                                + 
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