Virtual Software Systems, Inc. offers the following products and services:
VPARS (Virtual PARS) – VPARS is a software enhancement to z/VM that allows multiple virtual machines to transparently share a TPF (Transaction Processing facilty) database.
VTAPE (Virtual Tape) – VTAPE is an implementation of a virtual tape device in z/VM software.
ShadowDisk/Z (SDISK) – ShadowDisk/Z is a software enhancement to z/VM that allows multiple virtual machines to transparently share a z/Linux filesystem.
Services – Consultancy and training services.