It can be any board at all on your site. This is the "keyword name" of the board used as the name of the SQL table.
It is necessary as lines 101-109 need to set a session variable or cookie with the last visit information. Without this, markallread doesn't work. It is because of the way the system uses this session variable / cookie later on.
Donate to UBBDev today to help aid in Operational, Server and Script Maintenance, and Development costs.
Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.