# EPOC OPL Guide & Reference Glossary

## Index B

Term | Topic | Meaning | See Also
bitmap | Graphics and Interaction | A file, or an area of memory which is used to store a picture. The important features of a bitmap are its width, height and colour depth; shape information is held in a bitmap’s mask. EPOC bitmaps are stored in multi-bitmap files (MBMs), which contain one or more bitmaps. MBMs are indexed by ID number. | mask, ID number
bitwise operator | OPL Basics | An operator that operates on the binary representations of its arguments. |
bookmark | Data File Handling | A place marker in a database file. | database
bpp | Graphics and Interaction | Bits per pixel. The number of bits used to represent a unique colour in a given colour mode. The number of bits used to represent a colour in a given window or screen is sometimes called its depth. |
bug | Error Handling | An error in a program. |