ui-pdf-viewer - Geomview Manual

(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.