DC++ is a peer-to-peer file-sharing client for Direct Connect networks. It connects a Windows computer to independently operated hubs, lets people publish a list of selected folders, and transfers chosen files directly between their computers. A hub coordinates users, searches, and chat; it does not hold the shared files. DC++ therefore works differently from a website download or a cloud drive. Availability depends on another connected user, and every hub can enforce its own access and sharing rules.
Hubs set the rules
DC++ can open public hub lists or connect directly to a known hub address. It understands the older NMDC protocol and the newer ADC protocol, with secure address forms for hubs that support encrypted connections. A public hub may admit anyone who follows its rules. A private hub requires a registered nickname and password, often obtained through a separate forum or another hub.
The first connection needs more than an address. DC++ requires a unique nickname, and many communities require a minimum amount or type of shared material before they permit searching or downloads. Operators can remove users who break local rules. The DC++ developers do not administer those communities, so they cannot restore an account or change a hub’s content policy.
Search or browse
A search asks connected users for matching filenames. The results can contain several sources for the same file, and DC++ can place those sources under one queue entry. Browsing takes a different route: Get file list downloads another user’s directory index, then opens it as a tree. The list is metadata, not a copy of every file. Selecting an item adds the actual transfer to the queue.
DC++ also refreshes the local share list after folders change. Other people see only the paths published through that list, not the complete contents of the computer. Sharing a broad parent folder can expose more names than intended, so Open own list is a useful check before entering a hub with minimum-share rules.
Queues outlive sources
The download queue keeps the target name, priority, destination, and known sources. A transfer can pause when its source leaves and resume when the same file becomes available again. File lists and files no larger than 64 KiB receive the highest priority. Up to three highest-priority items can start while other transfers run, so a configured simultaneous-download limit is not an absolute ceiling.
A result can also stall even though the hub connection remains active. If automatic connectivity chooses passive mode, searches and peer connections have fewer possible routes. A firewall that permits hub chat but blocks transfer ports creates another confusing split: messages work while downloads time out. DC++ can detect settings automatically, but a restricted router, security package, or campus network may still require manual active or passive configuration.
Storage takes planning
DC++ can keep unfinished data in one directory and move completed files to another. That separation makes a partial transfer easy to identify, but moving a large file between partitions on the same physical drive can take substantial time and disk activity after the network transfer reaches its end.
The destination filesystem also matters. FAT32 cannot store a file larger than 4 GiB, even when the drive has enough free space. DC++ tries to reserve the required space when a transfer starts, so a queue may stop before the disk looks completely full. Moving an unfinished queue to another installation requires its settings, partial files, and an integrity recheck in the documented order; copying only the visible partial file does not restore the matching queue state.
