This Built-In function closes the stream file which was previously opened by a STM_FILE_OPEN.
All stream files opened should be closed before terminating a function. Once the stream file is closed, no further action against that file is possible until it is re-opened.
Related Built-In Functions: STM_FILE_OPEN, STM_FILE_READ, STM_FILE_WRITE, STM_FILE_WRITE_CTL
Refer to 9.208 STM_FILE_OPEN.