Epson 10020 - Manual (Page 223)

Executable file
A file containing program instructions, as opposed to data
created with an application program. An executable file has
the extension .BAT, .COM, or .EXE.
Execution speed
The speed at which the central processing unit can execute
commands. Also called operating speed. The Apex can run at
4.77 MHz or 10 MHz.
Extended partition
An additional MS-DOS partition; you can create one primary
MS-DOS partition and one extended partition.
Extension
A suffix of up to three characters that can be added to a file
name to better identify it.
External command
An MS-DOS command stored in a program file with the
extension .COM or .EXE.
MS-DOS must be able to find the
program file to execute the command. See also Internal
command.
File
A group of related pieces of information called records, or
entries, stored together on a disk. Text files consist of words
and sentences. Program files consist of codes and are used by
computers to interpret and carry out instructions.
Filename
A name of up to eight characters that MS-DOS uses to identify
a file.
Glossary 7