How can I script export using "All data visible on screen"?

edself

GM knows the screen range as when I use the script builder, it uses GLOBAL_BOUNDS parameter set to the screen corners. But how do I access that info?

The background - I want to create a basemap for a survey area. We are taking a load of geotechnical soils samples for a windfarm.

The user sets up the basemap.gmw as they wish to see it and I import the geotechnical stations and simply export multiple images, each showing one geotechnical sample station at a time.