+// stack.asm: WORD p_2dup, '2DUP',fasm
+
anchor:p_2dup[]
-Word: 2DUP
-----------
+=== Word: 2DUP
+
+....
+Data stack: ( v1 v2 -- v1 v2 v1 v2 )
+....
+"2DUP" is a function word that duplicates the top 2 cells on the data
+stack.
+
+====
+.Word: 2DUP
+[caption='Definition concept {counter:exec}: ']
----
-stack.asm: WORD p_2dup, '2DUP',fasm
+: 2DUP OVER OVER ;
----
-
+====