HAM, 545-546, 580-581 Hardware - differences, 926 Hardware Interrupts, 517 Hardware Sprites - reserving, 632 Height - by inner dimension, 108 Height variable - in VSprite structure, 625 Help - menu, 111, 260 HIGHBOX, 192 HIGHCOMP, 191 HIGHFLAGS, 191 HIGHIMAGE, 190, 192, 225 HIGHITEM, 192 Highlighting - menu item, 191, menus, 169, 169 HIGHLIGHTTEXTPEN, 58 HIGHNONE, 192 HIRES, 545 Hold-and-modify mode, 580 Hook structure, 312 HookEntry.asm, 794 Hooks --> Hot Spot - mouse, 266 HotKey(), 889