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under the security permissions set up for the client’s user ID. For example, the FTPD daemon
creates a new z/OS UNIX process for every FTP client connecting to it. After the new process
is created, the daemon changes the security environment of the process so that it is
associated with the security context of the logged-in user, instead of the server’s user ID. The
RACF FACILITY class resource
BPX.DAEMON is used by the servers for changing the
security context during this process.
3.1.3 How can FTP be used?
There is an FTP client program and a separate FTP server program ...