The system resource name (systemName property) is the RDO FILE name for the data set as it is defined to CICS.
For CICS, the close statement does not actually close the data set. The close statement releases record locks and position in the file.
When accessing the same indexed data set using two file names for the same physical data set or two file names that access a base data set and its alternate index, an indefinite deadlock can occur in CICS that does not raise the deadlock condition. When the file is not defined with LSRPOOLID equal to NONE in the RDO FILE entry and one I/O statement in a program has performed a get next on a file and another I/O statement performs a get...forUpdate or add statement for the same file (or alternate index) without ending the get next, this deadlock can occur. If you design this type of file access into your programs, make sure LSRPOOLID for the file is set to NONE to avoid the deadlock.