7.0(April 05): Replaced PDF_LaunchAcrobat behavior with PDF_LaunchViewer; replaced PDF_CloseAcrobat with PDF_CloseViewer; removed parameters from the PDF_Print behavior that are no longer supported.
3.0(May03): Changed default parameter for PDF_Print to FALSE, added a behavior to show/hide a message for Mac OS X.
2.2.1(Jul02): Added beginsprite event on the open behaviors, added PDF_LaunchAcrobat and PDFClose Acrobat
2.0 (Apr01): Complies with new features of PDF Xtra 2.0
1.1.2 (Dec99): ScrollTo complies to PDF Xtra 1.0 final release's API (includes ZoomTo and Scale)
1.1.1 (Dec99): not released
1.1 (Nov99): Implemented James Newton's workaround to avoid the "create PDF sprite" err at recompile