Document unique ID from lookup

In R6, it's easy to retrieve the document unique ID from a view. @DbLookup has an extra keyword that will return the lookup document unique ID.

Code:

server := @ServerName;
db := @Subset(@DbName; -1);
@DbLookup("": "NoCahce"; server : 
db ; <viewname>; <keyword>; 
<fieldname>; 
[RETURNDOCUMENTUNIQUEID])

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