Table 1.

Summary of hardware and software requirements for the key ViPAR server components

	ViPAR Master Server (VMS)	Local ViPAR Database (LVD) Server
Hardware	Physical or virtual server with at least two CPU cores, 8GB of RAM and 50GB of disk space	Physical or virtual server with at least 1 CPU core, 1GB of RAM and 5 GB of disk space
Software (pre-installed)	Perl 5.10 or greater, OpenSSH 5.4 or greater, MySQL 5.5 or greater, Apache webserver, R statistical software	OpenSSH 5.4 or greater, MySQL 5.5 or greater
Software (optional)	OpenSSL server-side certificates, SAS, STATA, denyhosts	denyhosts