In IBM's AS/400 and iSeries line of computers, CIW (Computer Intensive Workload) is a measure that can be used to compare the workload-handling capability of different computer models when running application programs in which most of the computer processor work is done within the applications.
i5/OS is the name IBM has given to its newest release of OS/400 V5R3. i5/OS runs on IBM's i5 servers, which are based on IBM's Power5 microprocessors.
A lock is a mechanism for controlling access to something. In programming, locks are often used so that multiple programs or threads on a one-at-a-time basis. Typically, a lock is of temporary duration and when the resource is no longer required, it is freed for locking and use by the next sharer in a queue.
In general, midrange refers to computers that are more powerful and capable than personal computers but less powerful and capable than mainframe computers.