The ACCSEC packet is sent by the client as part of the authentication process. It contains authentication information.
RDBNAM (string): the name of the database being accessed.
This packet type contains other properties, but they are only for very advanced usages. Please contact Gallium Data if you need to access this type of data.
You can change the database being accessed with
context.packet.RDBNAM = 'OTHERDB';
This may be useful in some cases, but keep in mind that this could confuse some clients.