Max number of Internet Explorer browsers?

[zpanderson]

I'm working on some load testing of a web application and I'm trying to start 70 concurrent scripts on one machine.  I am starting internet explorer from the command line using the -noframemerging switch so each browser opens in its own process.  Once I hit 29 Internet Explorer browsers I can not open any more (either from my script or directly from the command line).  Does anyone know of such a limitation?  I searched the web but can't find much info on this.  

Thanks!

[zpanderson]

I had an idea to try with 64-bit Internet Explorer and this works.  So it must be a limitation of the 32-bit browser.