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#### 7.2.150 ui-pdf-viewer

`(ui-pdf-viewer VIEWER)`
  Use the executable VIEWER for viewing the PDF-version of the manual when the ‘`Manual (PDF)`’ menu-item is selected in the ‘`Help`’-menu. If the `(ui-pdf-viewer ...)` command was never executed, then the default is to use the browser stored in the `PDFVIEWER` environment variable. If the environment variable is unset then the default is compile-time dependent.