How to open two saml apps once

Hi i am new to Okta, i have configured aws sso with Okta and i have add two saml apps in okta one is service now and another one is flex
Here my requirement is, if i open flex saml app then service now saml app also needs to authenticate
How to open these two saml apps once
if i open flex saml app first how to run serivce-now saml app run backgroud
if any suggestion that would be great