Welcome to KORG!

For Q1, did you copy the DLL to the computer and register it (regsvr32 kixforms.dll). Get the latest DLL from the KixForms forum on this site - sadly, KixForms.org hasn't been updated in a few years. The version available there doesn't work reliably with newer Windows versions.

Q2 - using Call runs the child script in the same Kix32 instance. If you want to run it asynchronously, you need to start another copy of Kix as well. You can use Run:
 Code:
$Cmd = %COMSPEC% /c Kix32.exe childscript.kix'
'Spinning off child: ' $Cmd ?
Run $Cmd
Defining the var lets you confirm the process with the message - remove this when it's working.

When I have lots of processing to do, I regularly spin off 20-25 child tasks in this manner. Keeping track of the number of child processes lets me fire off 5 more each time the count drops below 20.

Glenn
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Actually I am a Rocket Scientist! \:D