# EPOC OPL Guide & Reference Glossary

## Index A

Term | Topic | Meaning | See Also
application directory | Advanced Topics | The directory where the .app file which stores the translated OPL code for an application resides. This is <drivename>:/System/Apps/<appname>/. The application itself is called <appname>.app. |
application information file | Advanced Topics | A file containing information about an application located in the application directory. | application directory
argument | OPL Basics | A value used by a function; a function’s input. | value, function
array | OPL Basics | A list of values, all of the same type. | value
assign | OPL Basics | To give a value to a variable or constant. | value, variable, constant
asynchronous | Advanced Topics | A task which does not make the task which started it wait. | synchronous
atomic | Data File Handling | As a single, indivisible item. |