jquery - Window.popup Does not keep Session values -

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when system in main window acts , when generate bill through ajax , after generate bill window.popup open automatically show details in bill format. on time log in session not stored,
in short when window.popup open session value blank , after refresh main screen system log-out.
possibilities :
ajax creating issue session
window.popup not support session .
please give me suggestion .....

ajax creating issue session dont think so

window.popup not support session nope, support session

issue starting new session id. include following on top every page if on php starting session

if(!isset($_session)){session_start();}

including page opens on popup


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