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Excerpt

ExcelWriter's HotCell Technology provides the ability to dynamically retrieve or update data on a Web server based on modifications made in an Excel file on a client. HotCell Technology uses Excel VBA code embedded in the spreadsheet on the client.

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 The VBA code communicates with an application on a remote Web server. The VBA code is activated when the user modifies a cell's value. A "HotCell" is a cell in the client-side spreadsheet that is modified by the user.

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This method submits cell information in an HTTP POST request. On the server, the receiving page parses the information and updates
the data source. This solution is far less network-intensive because it just posts bits of information instead of the entire workbook.
However, the POST method is more complicated than the upload method and requires more code on both the client and server.

Hot Cell Samples