Looking for Definition of DLU or what DLU stands for?
VTAM ® can dynamically decide or choose the ALS to be used for an individual LU that serves as the Destination Logical Unit (DLU) in a session using the adjacent link station (ALS) selection function. ALS collection is only called when the SLU is the DLU. A local based LU or an application software residing in this VTAM cannot be the DLU.
For more details on the full form of DLU – dynamic logical unit click here Wikipedia.