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Groove RPC
GLRPC stands for Groove Lightweight Remote Procedure Call, a proprietary protocol used by the Groove Collaboration software suite, which was later integrated into Microsoft SharePoint Workspace before its discontinuation. It facilitated real-time communication, synchronization, and data sharing within Groove's peer-to-peer workspace environment..
Groove Collaboration Software was acquired by Microsoft in 2005 from Groove Networks and aimed to provide a secure peer-to-peer collaboration environment, enabling teams to work together on documents and projects without needing centralized storage.
GLRPC (Groove Lightweight RPC) operated on port 9080 to facilitate communication between Groove clients. It handled messaging, file synchronization, and workspace management by exchanging remote procedure call (RPC) messages over TCP and UDP.
Following its acquisition, Microsoft integrated Groove into SharePoint Workspace, extending collaboration capabilities primarily for offline SharePoint access. Despite its eventual discontinuation, understanding GLRPC's protocol behavior is important for legacy network configurations and security audits.