Have an ISAPI extension disconnect from the client

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ISAPI

I wrote an ISAPI Extension in C which hosts PowerBuilder code. It works great. The client PowerBuilder app performs an HTTP GET to the URL and my extension runs the requested code.

Another person who is using it has requested that in the PowerBuilder code he be able to disconnect from the client app and continue processing, storing the results in a database.

If possible, I can add a function to my DLL that the PowerBuilder code calls that would do whatever is needed to disconnect.

What I have tried:

The research I've done makes it look like I would have to run the PowerBuilder code from a separate thread and return HSE_STATUS_PENDING from HttpExtensionProc.

This would require a major restructuring plus I'm not familiar with multi-threading in C, I am primarily a PowerBuilder developer. A solution that doesn't require a major rewrite would be a big plus.