What information is stored in the Thai immigration computer system regarding visa denials?

Just to mention: Thai Embassy and Consulate are part of the Ministry of Foreign Affairs. The Royal Thai Immigration Bureau is a seperate department from the Royal Thai Police. Two different government organisations who not share the Immigration database.

I have read on this group the different Embassy/Consulates (where you get the visa) do not have a centrally connected computer system. But immigration officers do (in Thailand - where you already have the visa) I have seen it suggested several times on this site -- in case of denial try other embassy (for visa) or border crossing. Altought I think Glen offers solid advice..

Yes their system has the ability to record notes on your record such as interviews conducted, refusal of entry and banning,and also shows all current and history of passports - if you have multiple or replacement etc. it also shows all entries and depatures, and all addresses registered at.

You are playing with fire if you tamper with passports or get caught trying to enter the country illegally - it can have world wide repercussions in any future travel with denial of visas and refusal of entry based on "poor character" assessments.