OK, thanks Jon!
I even found a free script for stereoscopic rendering that may be worth a try:
http://www.scriptspot.com/3ds-max/scripts/3dhippie-stereocam
I don't know if it works with 2011 as it is written for 2010 but i'll check this.
As a subscrition customer I could even do a parallel install of 2010&2011 as far as I know...
Anyway, i'll find a way to get this running.
I contacted Visumotion yesterday, z.l.i.c.e.3D is a bit too expensive for me as they charge 1.700,-€ for a licence. Maybe I'll find a workflow on how to edit the streams seperately so that I could skip this expense. Their stereoscopic rendering plugin doesn't run under 2011 either.
I think as soon as I have finished my current projects, I'll grab my machine, move to my client's office for a couple of days and do some testing.
Thankyou for help, regards,
Lutz