Including the effects of the {O}(\gtrsim 1GeV) masses of the charm quark, \tau lepton and target nucleon in DIS phenomenology is discussed with applications to CC neutrino DIS: Neutrino data for F2 are revisited within the global analysis framework. A fully differential calculation refines the CC charm production process as a gate to extract {s(x), {\bar s} (x)} . New results are presented for a ``heavy quark'' version of the CTEQ6 set of PDFs and for (\nu \mu \rightarrow \nu \tau oscillation-signal) \tau neutrino cross sections.
PACS numbers: 13.15.+g
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