**Iterative methods**- Flexible GMRES, though this is not the focus of the package
**Preconditioners**- Block SSOR and ILU, possibly with block fill-in, and with various methods for explicit and implicit approximation of inverses of pivot blocks
**Data structures**- Internal, as a C++ class.
**Access operations on the data structure**- Retrieve rows and scalar information such as the number of nonzeros of the matrix.
**Operations using the data structure**- Multiply and multiply transpose by the matrix; solve and solve transpose
of the preconditioner, both the whole preconditioner, and the
left and right split parts.

**Manual**- Reference manual, 53 pages
**Example codes**- Yes, in Fortran, C, and C++

Mon Aug 25 17:46:10 PDT 1997