Multi threading Explained

Can someone help newbie with an in depth definition of multi threading as against single threading

HiIf you're talking about either T24 COB or online services, the term "multithreading" (technically incorrect IMHO) means that your task will be firstly initiated with "SELECT" routine which will prepare the list of records to be processed and then this list of records will be picked up one by one by several sessions (hence it's not multi-threading in fact) running so-called tSA agents. As soon as a record is processed, its ID is removed from the job list file (F.JOB.LIST.n, where n = 1, 2, 3 ...).It allows to proceed the task faster (of course if it can be processed this way).For "in depth" description I believe you can refer to T24 COB documentation.