What are control levels?
In my program there is I Spec with control levels L1, L2 , AND L3 are associated with three fields of a file as follows
And further two subroutines are getting invoke depending upon the level value i.e
L1 EXSR xxdsp (L1 at conditional indicator position)
L1 EXSR yydsp (L1 at level position)
What does it mean?