You are able to export the machine groups to files to be imported within another NetChk console.
It does not have the ability to export the machines to a text file or other format.
When creating the machine group, if you can have a list of machines within a .txt file, this .txt file can be imported into your machine group. That way you would have a file already created which containing your machines names.
Hope this helps.
So it's not possible to do what i want to do !
You might look at some of the reports to see if any contain the information you are seeking. Reports can be exported to numerous other formats.