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 Brian Germann
Jacques Couédor
JOHN DIDONE
Graeme Harris
Scott
© Omnis Software Ltd 2021 - Help with setup and design by Ädelfors Consult AB, Sweden Disclaimer: Omnis Software disclaims any responsibility for or liability related to Software, or any content or advice, obtained through this site. IN NO EVENT WILL OMNIS SOFTWARE BE LIABLE FOR ANY INDIRECT, PUNITIVE, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES HOWEVER THEY MAY ARISE AND EVEN IF OMNIS SOFTWARE HAS BEEN PREVIOUSLY ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
