Here are four possible scenarios for viewing PDF on the Web:
The browser supports PDF viewing, the PDF file is optimized, and the Web
server supports page-at-a-time downloading (byte-serving), so the PDF file
downloads a page at a time and displays in the Web browser window. This is
the fastest scenario possible for viewing PDF documents on the Web.
The browser supports PDF viewing, but the PDF file is not optimized or the
server does not support byte-serving, so the entire PDF file downloads to the
machine with the browser and then appears within the browser window.
The browser supports PDF viewing, and PDF files are embedded in an HTML
page. An ActiveX browser such as Internet Explorer supports navigating
through the document. Netscape Navigator-compatible browsers can display
the PDF document within an HTML page, but require a link to a full-window
view for navigation.
Acrobat or Acrobat Reader is configured as a helper application for the
browser, and the browser may support PDF viewing within the browser
window. The entire PDF file downloads to the machine with the browser, and
the Acrobat viewer launches as a separate application and displays the
PDF document.
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