When using sisNET CE under Citrix, check the following Wikis
There is a Bentley Wiki with recently updated information about using Bentley products on virtualized environments: https://communities.bentley.com/communities/other_communities/licensing_cloud_and_web_services/w/wiki/52439/virtualized-environments
More specific information about the use and conditions of running Bentley products under Citrix is here: https://communities.bentley.com/communities/other_communities/sign-in_assistance_and_web_services/w/wiki/52440/citrix-environments
A list of Bentley products that have been validated for use with Citrix is available here: https://communities.bentley.com/communities/other_communities/licensing_cloud_and_web_services/w/wiki/52441/bentley-product-validated-for-use-with-citrix
Citrix products have been renamed in 2021. The Citrix website with an overview of their latest products is available here: https://www.citrix.com/products/citrix-virtual-apps-and-desktops/