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Thank you very much for the pointer.  I got it working using a map.  It was a great exercise because it gave me a better idea what I can do with variables. I am  hoping to do something a little more intuitive.  I'm still interested in adding a UI that makes entering the key-value pairs obvious and easy.  I'm pretty sure this possible.   See the Attachments field in "Send with Map of Attachments" (Foundation).  Notice the dialog that pops up when you click the "..." button.  It lets you enter an arbitrary number of named attachments.  That's essentially what I'm hoping to achieve.  Any ideas (or pointers to sample code) that show you how to do that?

Thanks,

Halynn