It's a pretty common occurence: You imported archives without enabling automatic tagging, or you suddenly want to add tags to a lot of archives at once.
Editing tags manually for each file ain't gonna cut it...
Enter Batch Tagging, allowing for laser-focus, one-time operations over large sets of archives.
All your archives are shown in the checklist on the right, with archives with no tags pre-checked for ease of access.
Past that, it's just a matter of selecting a plugin, optionally plugging in special arguments for the run, and going ham on tagging! The arguments available for overriding will depend on the plugin.
If you set a timeout value, the batch session will wait the specified time between archives.
While a batch session runs, you get a live summary of what the server is doing, and can cancel at any time.