**What it is:**

- a set of libraries for dense linear algebra
- public domain
- based on Lapack, PBLAS, BLACS, (usually) MPI
- based on message passing paradigm
- using block-cyclically distributed matrices
- fast, scalable

**What it isn't:**

- easy to get for HP-UX
- easy to use, due to many parameters
- well documented, at least the many auxiliary routines