Different versions of Filemaker can run concurrently on a Win or Mac computer with sufficient memory.
I have run three versions - ver5.5 ver8 and ver11, for instance.
I sincerely hope I was that unclear.
Is there any extension known, in which you can script, without freezing/bugging filemaker.
If not, is there any info how exactly the interrupt to filemaker is done to say it can continue.