Passing a Map between 2 screens

Hello, 

I've created 2 screens in Service where one is a table: 

And the other is what you get when you click on a row: 

In my 2nd screen i do a loopup for the ID (in an external system, not SuperOffice) and populate the dropdown with all the different products. 

What i would like to do is to do this also show the correct product name in the table itself, and to do this i can either to the same HTTP-request to my external system on both pages, or figure out a way to do 1 lookup and share a map with the values between the screens. 

Is it possible to share/pass a map between screens? 

//Eivind

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