# EPOC OPL Guide & Reference Glossary

## Index I

Term | Topic | Meaning | See Also
ID number | Graphics and Interaction | An integer representing a bitmap in an MBM file. Unlike OPL array indices, MBM id numbers start at 0 (zero). | bitmap, mask
index | Data File Handling | A listing of a sort order on a table stored in the database file itself. This can be used to vastly increase the speed of data lookup. | key, table, database
integer | OPL Basics | A 16-bit signed integer value. | value, long integer
interpreter | OPL Basics | The program running on an EPOC device that runs an OPL program. | program