(1) The DB2 structure that describes an application's connection, traces its progress, processes resource functions, and delimits its accessibility to DB2 resources and services. Most DB2 functions execute under a thread structure.
(2) A stream of computer instructions that is in control of a process. In some operating systems, a thread is the smallest unit of operation in a process. Several threads can run concurrently, performing different jobs.
(3) The messages or documents that capture a written conversation about a topic. In Notes, a thread consists of an initial mail message or document and all its replies, contained in a view or displayed as a history in a document.