WWM_BLK
(void) var_setnum("m_blk", WWM_BLK);
if (new & WWM_BLK)
tt.tt_availmodes |= WWM_BLK|WWM_UL|WWM_DIM|WWM_USR;
wwcursormodes = WWM_REV | (wwavailmodes & WWM_BLK);
if (wwavailmodes & WWM_BLK)