The OCA user account is used in an automatic fashion by a "bot" (an automated script) to populate and update Proteopedia pages named after PDB entries (such as 1h88) and seed those pages in part with content aggregated by the OCA Database and Browser. This account and the bot that uses it is maintained by Jaime Prilusky.
The OCA Database and Browser was developed in 1996 by Jaime Prilusky of the Bioinformatics Unit, Weizmann Institute of Science, Israel.
Oca is the spanish word for goose, but many suspect that its selection was inspired by Arthur C. Clarke's science-fiction novel 2001: A Space Odyssey.