Backdrop -->
Backdrop Layer, 706
Background pen, 584
BACKGROUNDPEN, 58, 141
Backup - of display areas, 705
Beam synchronization, 600
BeginIO(), 448, 449, 520, 886
BeginRefresh(), 95, 97, 97, 110, 115, 128, 244, 261, 721
BeginUpdate(), 128, 711, 721
Behind - open screen, 49
BehindLayer(), 708, 711
Bell - visible, 75
BgPen - in RastPort, 584
BindDrivers, 758
BitMap -->
BitMap Structure -->
BitMapScale(), 598, 612
BitPlane -->
BLIT Interrupts, 519
Blitter -->
Block - graphics with layers, 708
Block Input, 203
Block Pen, 106
BLOCKPEN, 57
BltBitMap(), 596, 597, 612
BltBitMapRastPort(), 596, 597, 612
BltClear(), 592, 612
BltMaskBitMapRastPort(), 596, 598, 612
bltnode structure, 600 - creating, 601, linking blitter requests, 600
BltPattern(), 594, 612
BltTemplate(), 595, 596, 612
BNDRYOFF(), 590, 611
Bob structure, 635
Bobs - introduction, 613, simple definition, 615
BoolInfo structure, 139
BOOLMASK, 139
Boopsi -->
Border -->
Border structure -->
BORDERHIT, 648
Borderless -->
bottommost - in GelsInfo, 624
Box - menu item, 180
Break key, 432
Broadcast - IDCMP events, 248
BuildEasyRequest(), 217, 218-219, 222
BuildEasyRequestArgs(), 219, 222
BuildSysRequest(), 218, 222
Bus error, 474
BUserStuff, 651
Busy Pointer, 274
buttongclass, 297
buttonglclass, 315
B-Pen - see BgPen