The research article entitled “Diciclo: Flexible User-level Services for Efficient Multitenant Isolation” of G. Kappes and S. V. Anastasiadis appears in the May 2024 issue of ACM Transactions on Computer Systems (TOCS). This is the first time that a research group from Greece independently publishes an article in ACM TOCS during the 40 year history of the top systems journal.