MapInfo/Mapbasic - test if a mapper is open

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I'm hoping someone may be able to help me. I have a custom menu that I created which opens a mappable table and I'm trying to work out how I open it when

1. there is no other .tab files or mapper windows open
2. there are other .tab files open which are in a mapper.

My question relates to the syntax of how I test if there is a mapper open. I then need to use the results of the test to work out whether I use 'map from' or 'add map'.

thanks



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