SAP Login screen appearing in browser after logged into sap gui

Hi

Need help.

I have logged into SAP gui and then testing some service under SICF, URL opens in browser window and again SAP login screen appears in browser.

Is there a way of executing service seamless, once authenticated in GUI then service should be displayed in browser with out any additional logins.

Logging to GUI, will it create necessary cookies required for browser to understand that the user authenticated already.

Please assist

Thanks