I thought I was getting the hang of these bangs and brackets...

I have a form with 2 subforms. The ID field of the 1st subform is the master link field I need for the 2nd subform. I've tried everything (except the correct one). How does one reference a subform field from a different subform in the Link Master Field?

I did define a(n invisible) text field on the parent form and set it in the on current event of subform1 but I'm unhappy with this.

Thanks for any help you can provide. And if you can recommend a good source of info on referencing form fields, I'd really appreciate that, too.