UUCP can send and receive files between systems. The uucp command queues requests for file transmission or retrieval, and invokes uucico to establish the connection with the remote system and complete the transfer. Based on configuration specifications, file transfers with the remote system might not be allowed. The cron daemon can be used to invoke uucico to send the queued files in the background when appropriate. After uucico has made a connection with a remote system, and local uucp requests have been processed, file transfer requests created on the remote system are processed.