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New Macro Features Added in SAS® 9.3 and SAS® 9.4
SAS Institute, Inc.
This paper describes the new features added to the macro facility in SAS® 9.3 and SAS® 9.4. New features described include the /READONLY option for macro variables, the %SYSMACEXIST macro function, the %PUT &= feature, and new automatic macro variables such as &SYSTIMEZONEOFFSET.
You can download the .pdf of the paper from here.