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you can configure tableau to integrate with Active Directory or have Tableau manage the users.
The user id and password to get to the server via the web browser or client depends on how you configures tableau server.
server URL access is same as a web address
for ipads you can connect over browser or via app available in appstore. If using AD auth ipad needs to be on corp network/vpn. For non-AD users, this can be secure over the web.