Turn On “About This Page” in Oracle R12 Web Forms

Set Following Profile Options as Required at User or Site

Personalize Self-Service Defn...........................= YES
FND: Personalization Region Link Enabled.........= YES
Disable Self-Service Personal..........................= NO (Only at Site)
FND: Diagnostics ...........................................= Yes

Bounce the Apache Server

Login to Application you can see the About This Page Link on all web pages

By Using About This Page link you can have almost all information of technology Stack