GlossaryGuide

Down Time The period of time when the computer system is not operational.

Downline Load The transfer of a program or data file from a control computer (master node) to a remote computer.

Document Code (DOC Code) The code which identifies the specific type of return or document that was filed or processed. The document code is the fourth and fifth digits of the DLN.

Document A tax form, voucher, or written evidence of a transaction.

District Office (DO) Now known as Area Offices – One of the major divisions of a region, usually a state.

Distributed Input System (DIS) The Distributed Input System (DIS) is the on-line realtime system that replaced the Directed Data Entry System (DDES) located in the Data Conversion Branch. The primary purpose of the DIS is for the data entry of a wide variety of tax returns and other tax related forms or documents.

Disk Drive Refers to the physical hardware that holds a diskette or cartridge. The disk itself may be physically or dynamically removable or non-removable depending on the design. The disk drive may take a floppy disk,, disk cartridge, or it may contain fixed hard disks.

Disk or Diskette Storage media for computer data. Disk refers to an individual platter constructed of a metal alloy which contains tracks cut into the platter so that a magnetic head can read or write on it. Diskettes are mainly constructed of a vinyl or plastic covered with a cardboard jacket. It also contains tracks.… Continue reading Disk or Diskette

Discriminant Function (DIF) At the ECCs, tax returns are given a computer-generated score called DIF (Discriminant Function) score, which identifies those returns with tax change potential. This is most often associated with the examination function.

Designated Payment Code (DPC) A payment designated by the taxpayer for a type of tax.