A dependent LU must be activated, controlled, and owned by a VTAM® SSCP. Ownership of dependent LUs is determined when the SSCP establishes an SSCP-LU session. Dependent LUs have the following characteristics:

• They generally have unique, fixed, preassigned local addresses within the PU that are specified on the NCP or VTAM definition statements using the LOCADDR operand of the LU definition statement. With dynamic definition and with switched connections, the address is defined during the PU and LU activation process. For more information, see Defining dependent LUs dynamically.
• They are subordinate to a PU. If defined manually, they must be defined under a PU.
• They require an SSCP-LU session and an SSCP-PU session to be active to VTAM; these sessions must be established before any LU-LU session can be activated.
• They normally act as SLU only.
• They can have only a single session. Even an LU that supports LU 6.2 protocols can have only one session if it is defined as a dependent LU.