## Input/Output Device Driver Reference

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### Glossary - T

T

text window - See VIO window.

thread - The smallest unit of operation to be performed within a process.

thunk - term used to describe the process of address conversion, stack, and structure realignment that is necessary when passing control between 16-bit and 32-bit modules.

thunk layer - An interface that converts 32-bit parameters to 16-bit parameters, and maps linear addresses to segmented addresses.

time slice - (1) The period of processing time allocated for running a program. (2) An interval of time on the processing unit allocated for use in performing a task. After the interval has expired, processing unit time is allocated to another task, so a task cannot monopolize processing unit time beyond a fixed limit.

tuple - In a relational database, a part of a relation that uniquely describes an entity and its attribute.