The Current Data Set Allocations list supports both primary commands and line commands. The displayed list is the list of ddnames that you can see by scrolling up and down. You can use primary commands to limit what is displayed in the list. Many of the primary commands work only on the contents of the displayed list.
ISRDDN can also create pseudo-ddnames that show useful data set names. For example, the LPA command adds two pseudo-ddnames, LINKLIST and LPALIB, which contain lists of the current link list and LPA libraries.