I’ve used it this way and it works; the browser (Firefox) opens the PDF in a new tab (after you allow to open pop-ups):
Calculate lcdevice as $cdevice.$ident ;; store current print destination
Do $cdevice.$assign(kDevOmnisPDF)
Do Omnis PDF Device.$settemp(kTrue,1) Returns lID
Set report name YOUR_REPORT_CLASS
Print report {YOUR_REPORT_CLASS (your parameters...)}
Do $cdevice.$assign(lcdevice) ;; restore print destination
Do $cinst.$clientcommand("showpdf",row(lID))
Rainer Greim on 
Scott on Scott on 
Paul Mulroney on 
Brian Germann on Scott
Rainer Greim
Rainer Greim
Brian Germann
Scott
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