> My bet would be on JEMM as the one which messes with memory control  
> blocks.

You're right. It is JEMM.

> Yup. TSRs which are never unloaded would not be a problem, otherwise
> they could leave holes, but that's life... One could even re-run your
> program and try to relocate the ENV again into such a hole, if it's big
> enough :=)

Sure, you can run it any number of times.

> FreeCOM does maintain the master environment
> pointer (its segment) in its PSP:3Ch slot, additionally FreeCOM seems
> to use the contents of that 'slot', not some copy it made, whenever
> it needs to access the ENV.

3Ch is reserved as far as I know. Do you mean 2Ch? That's what my program  
modifies.

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