UCopList structure, 602
UnlockIBase(), 283, 289
UnlockLayer(), 707, 708
UnlockLayerInfo(), 708, 708
UnlockLayers(), 708
UnlockPubScreen(), 51, 56, 76
UnlockPubScreenList(), 54, 76
UpfrontLayer(), 708, 711
User Interface - libraries, 24
User stack, 477
USEREQIMAGE, 204, 213
UserExt, 651
Using A Device, 447
USP, 477
Utility -->