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The "Batch Search" option allows you load a file of identifiers and perform the same search for each one. For example, you could search for all ISBNs or MMS_IDs in a list and download all the results to a file. The list must be in plain text (TXT) format with one identifier per line. To perform this search, check the "Batch Search" option below the search boxes. The second search box will go away and a folder icon will appear. Clicking this icon will allow you to select the text file with identifiers. You can then use the drop down menu to the left of the search box to indicate what kind of identifier is in the file. (Use "Record Number" for MMS_IDs or OCLC IDs).
After selecting the file, click the Search button. Rather than populating the search results window, you will simply be prompted for the name of a file to download the results to.