Citrix Global App Configuration service (GACS) is a Citrix IP solution and service used to configure, manage, and distribute Citrix Workspace app (CWA) or Client App-specific end-user settings across all device OS. The solution can auto-update the Workspace app and manage client app versions. As of this writing, GACS supports Windows, macOS, Android, iOS, and Chrome OS.
The end user settings can be configured and managed, including experience when a user accesses Citrix Workspace via a browser and launches virtual apps and desktops over HTML5 experience. Settings are configured and mapped to a Citrix Workspace application at the store URL level today. As part of the GACS roadmap, this scope is expanded to map configured client settings to user groups within a store.
GACS is a cloud service that can be used to configure and distribute settings across cloud and on-premises environments. You don’t need to claim the domain or establish the Workspace store URL to distribute the settings for cloud deployments. In an on-premises environment, Citrix GACS uses the AutoDiscovery services to establish the URL claim and connection to the cloud for StoreFront URL or NetScaler Gateway. This service establishes a secure connection to your domain and all the store URLs based on the company configuration. Further, all the stores (on-premises and cloud) will reflect in the app configuration user interface, and settings can be configured and distributed per store from the same interface.
More information can be found here: https://docs.citrix.com/en-us/tech-zone/learn/tech-briefs/global-app-configuration-service.html
