Questions on the comparison between Oracle Forms and Oracle APEX

Hi All,
The link below presents information about Oracle Application Express for Oracle Forms Developers, the table at the end of the page shows a comparison between Oracle Forms and Oracle APEX, all the points of comparisons are clear for me except 3 points which are:
•Locking, what is meant by locking models?
•Database Connections, what is meant by Synchronous/Asynchronous connections in Oracle Forms and Oracle Apex?
•Architecture, what is meant by 2tier and 3 tier connections?
http://www.oracle.com/technology/products/database/application_express/html/apex_for_forms.html
What I need is a simple explanation for these points without deep details.
Thanks

Hi
That is how I understand that document:
Locking: Forms, by default, locks a row as soon as the user starts modifying the data. That is pessimistic locking. Apex, on other hand (and optionally forms also) do not lock the record, but before applying any changes checks if the data has changed since the user queried it (what for some reason is called optimistic "locking")
DB connections: I am not sure why they used the terms synchronous/asynchronous, but the difference is that Forms, by default, keeps an permanent DB connection while the user is using the application, while Apex gets a connection from a connection pool every time a page is requested/submitted.
Architecture: Forms (in its web version at least) has 3 tiers: the browser, the appserver where the forms service runs and the database. As Apex runs inside the database, there are only 2 tiers: the browser and the database (though you still may need an http server in between which serves static content, I don't think it is considered part of the application in this context). If you are talking about client/server forms, then there are only 2 tiers.
I hope this helps!
Luis

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