(I rewrote my answer after David Heffernan's comments.)
1. Bypass
" " " \\" TWebBrowser, , ( , ).

2. Windows XP 7
, Windows XP , Windows 7 . , - . Windows XP , .
3.
, IE , , . , Internet Explorer FEATURE_WARN_ON_SEC_CERT_REV_FAILED, IE , : "Internet Explorer , , ".

4. Silent Mode
, TWebBrowser Security Alert " . ?" , TWebBrowser.Silent True, "". " ", JavaScript , TWebBrowser .

5.
, , TWebBrowser.Silent False, ( " " "" ). ( , PascalScript), ( Confirm).