When uucico is invoked, it searches the information provided by the Systems file (and compiled into the configuration file) for the remote system indicated on its command line. If the sched field of the matching entry indicates that it is valid to contact the remote system at that time, uucico then checks to see if a connection with the remote system is already in progress (a lock exists in /usr/spool/locks for the system or system IP address). If a connection is already in progress, uucico will not initiate another connection at this time. Otherwise, uucico will attempt to open a TCP/IP connection using the remote system's IP address. If successful, it uses the contents of the chat_script field to complete the connection.