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Maximum number of simultaneous downloads limit
This limit isn't "useful" as a part of a "simple" site hosting (only visited html/php text pages) but can become important when a file to be downloaded is made available to the visitor or if a video is played (= downloaded) on/from the website.
In this case, 30 people with the same IP (a relatively rare case but possible within an administration or a big company for example) can download the file simultaneously. The 31st person will have to wait for a space to be freed before he may start downloading.