web sites are traditionally client/server apps. You browse to a site and it fills your browser with input fields, you fill in the fields without any interaction with the server, then you submit all your answers at once by pressing the submit button (or save button or enter button or some button.)
Any specific key events or mouse movement events would be handled via Javascript -- that runs on the client side and not the server side. This is true for a website regardless of whether it's a classic ASP page or ASP.NET page or PHP, Python, Ruby, etc. page.
Sincerely,
Carl
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