%let dsn=ExampDat; ** creates MACRO variable & gives a value **; 
data &dsn ;        ** References MACRO variable **; 
input Y X @@; cards; 
1 3 2 4 3 7 4 6 5 9 
 ; 
 proc plot data=&dsn; plot Y*X; label X = "X in &dsn data"; 
title "Dataset &dsn "; 
 data b; set &dsn(firstobs=3); 
 proc print data=b; run;