http://www.web-one.org/new-5639085-4913.html
ActiveForm and TThread  
Web one -> Borland Delphi Activex Controls Writing  
Reply by: Byungho Jeon -- Dec 2, 2003 14:57:18          Hello Jeff    I have some question about CheckSynchronize in ActiveForm   TThread..
I used your code to solve thread synchronize problem!! It works fine only
one IE!!!
If I launch several IE with ActiveForm include TThread, IE show this message
"CheckSynchronize called from thread $964, which is NOT the main thread"!!!
Can I use Only ONE Instance?    Regards    Byungho    "Jeff Giddens"