When DFHZATDX or DFHZATDY is invoked at INSTALL of a Client virtual terminal, it:
If CICS detected no conflict with a currently-installed remote TERMID, SELECTED_SHIPPED_TERMID contains the value pointed to by INSTALL_SHIPPED_TERMID_PTR (that is, the name specified by the Client, or the "VTPREFIX" name generated by CICS).
If CICS detected a conflict with a currently-installed remote TERMID, SELECTED_SHIPPED_TERMID contains a CICS-generated alias.
When DFHZATDX or DFHZATDY is invoked at DELETE of a Client virtual terminal, it takes no action and returns.