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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I don&#8217;t think that I would really require
multiple engine instances if I could use separated sessions (system states). I
could keep the states around and swap them in and out as required.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>One possible problem: I create a new
session and run a script in it. This script triggers the execution of another
script. I would then need to unplug the current session, create a new session
and run the script inside it. After the second script finishes I need to put
the original session back and let it finish executing. I can imagine that it
would give problems to swap sessions while one was executing (although it was temporarily
suspended).<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Using AppDomains or multiple Threads doesn&#8217;t
seem like a workable solution. It would get very complex to make the data the
PythonEngine needs to operate on available in the other AppDomain. As for using
threads: multithreading and user interfaces don&#8217;t work well together. (I
would have hoped that WPF fixed this problem, but alas&#8230;)<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I don&#8217;t really need an immediate
solution for this. I&#8217;m just experimenting now. I think that the scenario
that I&#8217;ve outlined is an important use for IronPython: to integrate in a
.NET application and extend it with programmable and flexible extra functionality.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

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