## Display Device Driver Reference for OS/2

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### Glossary - F

F

Far call - Code that calls from one segment into another segment.

fillet - An arc that is tangential to the end points of two adjacent lines. See also polyfillet.

filter adapter device driver - A special class of adapter device drivers that do not manage the hardware directly, but monitor the stream of commands between a device manager and an adapter device driver. See Device Manager and adapter device driver.

first-party DMA adapter - See bus master adapter.

flag - A characteristic of a file or directory that enables it to be used in certain ways. See also archive flag, hidden flag, and read-only flag.

flat address - See linear address.

frame styles - Standard window layouts provided by the Presentation Manager .

freeze and thaw services - Functions that prevent a DOS session from executing (VDHFreezeVDM) until the matching thaw function (VDHThawVDM) is called. The freeze occurs when the specified DOS session leaves kernel mode .