  This article outlines how the quantum Monte Carlo directed loop update
recently introduced can be applied to a wide class of quantum lattice models.
Several models are considered: Spin-S XXZ models with longitudinal and
transverse magnetic fields, boson models with two-body interactions, and 1D
spinful fermion models. Expressions are given for the parameter regimes were
very efficient "no-bounce" quantum Monte Carlo algorithms can be found.
