Field help (AYLSUIPRG) 

'Yes' to specify that it is the L4G processing that returns the code of the dynamic link in a sub-program setup.

Dynamic sequencing defined by the L4G processing

The L4G processing can decide the link to sequence by returning the link code in a sub-program setup.

The code of the dynamic link can also be stored in a session variable (user variable).
In this case we specify:

The page displayed following the sequencing of several dynamic links is the web page associated with the last dynamic link processed.