Writing a global variable to feature memory.

[Peter Hamilton-Scott]

I have a DmOpenRef variable. My app then notifies a routine that 
performs a GPS function every second. This works well. I can't/dont 
trust my DmOpenRef variable to be valid, and I think the strange 
problems I've been having with resets is because the variable is no 
longer global. So I thought if my app opened the .pdb file and stored 
the DmOpenRef in feature memory, then my callback function can simply 
look at it and use it to process the .pdb file that is already opened. 
That way, if another app gets launched, my callback will still run and 
can use the .pdb file.

My question is: do you think this will actually work ok?
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