Round Tripping

a term used mainly to refer to the transformation of  a computer file into a different type with the option to return to the original type.  Microsoft uses this term in conjunction with Office 2000 products.  For example, an Excel worksheet or an Excel chart can be saved as an HTML file with many of the interactive features of Excel (such as replacement of data and recomputation of functions) in the browser rather than Excel.  However, the HTML files have round-trip recovery features for saving the file back to an Excel worksheet or Excel chart.  See HTML.