TMASK Type: Adverb (Real) Use: An Adverb which controls tasks executed during a Y2K RUN. A bitmask controls which steps of the test execute: TMASK +1=>SORT, +2=>IMAGR, +4=>APCLN, +8=>CALIB, +16=>IMAGR-clean, +32=>VTESS. For example, TMASK=54 would execute IMAGR (dirty image), APCLN (clean, residual), IMAGR (clean), and IMAGR/VTESS..