OPN Display all Tasks which have opened a File

OPN All tasks (TSN's) which have opened the file will be displayed (utilising the OPEN User Option). A prerequisite of this Action Code is that the system administrator has started the CFS-Holder task under TSOS (/ENTER CFS.S. LMSLIB(CFSHT) ). If the file (SAM/PAM) has been opened in output mode, the current contents of the file can be displayed with the Action Code D (Display).