# EPOC OPL Guide & Reference Glossary

## Index E

Term | Topic | Meaning | See Also
EPOC Emulator | OPL Basics | The PC program distributed with this documentation which can be used to run and test out OPL programs. |
execute | Introducing OPL | To follow an instruction. When OPL acts on an instruction statement in a running program, the instruction is said to have been executed. | statement, run
expression | OPL Basics | A value formed by performing some combination of operations, values and functions. | function, operator, value