The Cockpit Display Systems (CDS) Subcommittee develops ARINC 661, Cockpit Display System Interfaces to User Systems. It is being expanded to meet OEM requirements for new aircraft. ARINC 661 defines a Graphical User Interface (GUI) to displays. It also defines GUI objects. ARINC 661 will enable flight crews to interact with the CDS using a cursor control device. This guidance and requirements are documented in ARINC Specification 661: Cockpit Display System Interfaces to User Systems, Part 1, Avionics Interfaces, Basic Symbology, and Behavior and ARINC Project Paper 661: Cockpit Display System Interfaces to User Systems, Part 2, User Interface Markup Language (UIML) for Graphical User Interfaces. This activity is authorized by APIM 19-010.