Access 2103 Web App: How to create a calculation to update a field

Can do this in desktop, but migrated a desktop set of tables to web app. and brain drain on all the details.

Quick & simple; have to fields and want the third to calculate and then update a third field.  The key if I'm asking right is the 3rd field exists in the table, I just want it "filled in" based on values of the other two fields...
VirtualKansasAsked:
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PatHartmanCommented:
Normally we don't store calculated values but you may have to with a web app if your query options are limited.  Look to see if a Data macro will solve the problem.
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VirtualKansasAuthor Commented:
OK, will lead me to next question: "Access 2103 Web App: How to create a data macro calculation to update a field"
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PatHartmanCommented:
Since my response didn't actually answer your question, you probably shouldn't have awarded me the points and closed the question.  That will keep others from attempting to answer.

As I said, I don't use web apps (and won't until they support a programming language), I can't offer specific help.  All you have to work with are macros so that is where I would start.  I'm not even sure what events are available for web forms.  So, you'll have to examine the events available for the control that you want to trigger the update and decide which would be most appropriate (BeforeUpdate is the event I would use on a standard form but I don't know if that event is available or if it fires under the same circumstances).  Then examine the macro actions available.
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