If your specification files are in .psr format, see Convert a Batch of Specification Files to ISF Format.
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Open a command line window (START +R, and type cmd for example).
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From the command line, type the path to the External Editor, type externaleditor, and leave a space.
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Type the path, if necessary, and the name (<file name>.isf) of the files that you want to print, making sure that you leave a space between each file name.
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Type /p.