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CICS Explorer 5.3 includes a new Remote system Explorer Explorer view for z/OS assets which provides this capability
Due to processing by IBM, this request was reassigned to have the following updated attributes:
Brand - Servers and Systems Software
Product family - Transaction Processing
Product - CICS Transaction Server
For recording keeping, the previous attributes were:
Brand - WebSphere
Product family - Transaction Processing
Product - CICS Transaction Server
It appears that the ability to have two open edit sessions (one with Explorer and one with Edit) was by design:
https://www.ibm.com/developerworks/community/blogs/JoeWinchester/entry/z_os_explorer_and_file_locking
Personally, I think that this "optimistic lock" is opening the door for data loss. It gives the option to overwrite someone else's changes without even looking at them. The "pessimistic lock" forces the user to review their changes once the first edit is complete, since it prevents the second editor from getting an edit session in the first place.
This additional step to protect the data is one of the cornerstones of the Mainframe; one of the major architectural differences that sets the platform apart from distributed systems. The idea that the "data comes first" is what makes data loss on the Mainframe such a rare occurrence. It's really too bad that these new, cool development tools come at the expense of data integrity.
I agree on your first comment. Regarding the default opening action (browse or edit) the customer would like to have an option to decide what the default behaviour should be
I think that z/OS Explorer should only open in for browse if someone in ISPF Edit already has it open for write (and vice versa).
If nobody has the dataset and I open it in z/OS Exporer, I don't want to have to do something different to edit.