A restart option is available for storing intermediate results and restarting the simulation at an intermediate time with modified boundary conditions. The basic source-sink term represents wells.
All boundary conditions can be functions of time.
The program runs in batch mode. Input is developed by copying an example data set and creating the new input file with a text editor. The program produces output files with echo of input and results in tabular format. Two techniques are available for solution of the finite-difference matrix equations. One technique is a direct-elimination solver, using equations reordered by alternating diagonal planes.