Callserver and CallOut

Can anybody specify the difference between the Callserver and Cgi-Callout?
In the Dev Guide it is specified something like Call Server is Asynchronous.Can anybody explain me detailedly about this and their difference.

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Frederik

This question should have gone in the Templating forum.

A callout: will show a button next to a Form field, that onClick will open an popup window that displays the HTML rendered by a CGI call to the server. The popup window typically contains an HTML form that onSubmit will return a value to the opener (the Form), through javascript.

A callserver: is a non-visual CGI call to the server (conceptually similar to an AJAX call), whereby the resulting HTML should contain only javascript calls into the FormAPI of the caller.

GOMATHY

To my understanding from your reply the differences between the Callserver and Callout is that a User-Interactive window would populate in the Callout.
And if we are using the CallServer then we pass values dynamically to the Server.Is it correct?

Pawan

Both the callout and callserver can access values from the dcr form. Its not always mandatory that a user interactive window will be shown incase of callout, it depends on your code, However, callserver always executes the scripts without showing any window to the user.