Do you want to know who are all editing the member of PDS? Here’s a command. While editing a member, you get a message Member in Use.
Here’s a Command
If you want to know who else is using that member, press F1 twice, or you can type WHOHAS in front of the member. It will show you the mainframe ID of that person.
You can inform the team member who opened so that he/she will come out from editing.