 temporal integration.  A solution limiting procedure produces
monotonic solutions near discontinuities while maintaining high-order
accuracy near smooth extrema.  A modified tiling procedure maintains processor
load balance on parallel, distributed-memory MIMD computers by migrating
finite elements between processors in overlapping neighborhoods to produce
locally balanced computations.  Grids are stored in tree data structures, with
finer grids being offspring of coarser ones.  Within each grid, AVL trees