Citrix MetaFrame is thin-client/server system software for Microsoft's
Windows NT Server 4.0, Terminal Server Edition.  MetaFrame delivers a
comprehensive thin-client/server solution to the enterprise by
extending Windows Terminal Server with additional client and server
functionality - including support for heterogeneous computing
environments, enterprise-scale management and seamless desktop
integration. MetaFrame transforms the way organizations deploy, manage
and access business applications by providing improved application
manageability, access, performance and security. Citrix MetaFrame
system software, which incorporates Citrix's Independent Computing
Architecture (ICA), provides a complete thin-client/server computing
solution for multi-user NT 4.0 environments.

(From http://www.citrix.com/products/metaframe.asp)