The /usr/spool/uucp/SystemName directories are the uucp program spooling directories on the local system. The uucp program creates a SystemName directory for each system listed in the /usr/adm/uucp/Systems file, including the local system.
Each SystemName directory contains queued requests issued by local users for file transfers to remote systems and for command executions on remote systems.
The uucp program uses several types of administrative files to transfer data between systems. These files are stored in the SystemName directories. They are: Contain directions for the uucico daemon concerning file transfers. Contain data to be sent to remote systems by the uucico daemon. Contain instructions for running commands on remote systems. Contain data files after their transfer to the remote system until the uucp program can deliver them to their final destinations (usually the /usr/spool/uucppublic directory).
Daemons: uucico(8), uusched(8), uuxqt
Commands: uucp(1), uux(1) delim off