Can a trigger on one slide use a layer on a different slide?

You could use a trigger that lightboxes a slide and then shows a specific layer on that slide.

Thanks for your response Michael. How do I do that I have looked but don't understand how to choose a specific layer.

Thank you for your response Michael,

I have actually done what you suggested. I refer to another post where my questions have merged.

http://community.articulate.com/forums/p/43740/236667.aspx#236667

I am still trying to be able to access that layer from elsewhere. Not sure how to do it.

Hi Graham and welcome to Heroes! 

As Michael mentioned you could set it up within a lightbox, and there is a "condition" you can add that it would happen when slide X is in a lightbox - that's the element you're looking for to show a particular layer. 

You're not going to be able to pull content from another slide into the current slide w/o using a light box.  Even then it's a light box so you'll get the whole slide.

But, you can control visibility of objects, slide layers, other vars, etc in other slides with variables and conditions that are set from a different slide.  If that makes sense.