Citrix allows a user to connect to a remote desktop. This remote desktop is a virtual desktop that is generated by the Citrix server. Since this is a generated desktop for each user, it can be customized for the applications that each remote user will use. In your case it is VFP with the associated libraries. This also includes any other dependencies such as active-x components, app files (such as FoxyPreviewer), and the VFP runtime support files. These virtual desktops also need to be able to connect to a common share drive for the databases (if DBC/DBF) or to the SQL server.