Не, не съм сигурен, четох го в някакви китайски сайтове, които на всичкото отгоре бяха down. Но ми се стори като цитат от някаква документация на Delphi, ето го:

В отговор на:

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LiChaoHui - 1849809
多谢几位兄弟, 非常感激, 每人100分作为答谢

Delphi的帮助中,关于SupportCallback是这么解释的,
Determines whether the streamed connection component can handle
callbacks in the application server interface.

property SupportCallbacks: Boolean;

Description

Use SupportCallbacks to indicate whether the connection component
can marshal callback functions in the application server's interface.
When SupportCallbacks is True, the connection component can marshal calls
from the application server to the client application over an interface
supplied as a callback.

For TSocketConnection, callbacks are optional. Set SupportCallbacks to True
if you are using callbacks as part of the application server抯 interface.
When SupportCallbacks is True, the socket connection component requires
WinSock2. Set SupportCallbacks to False if you are not using
callback functions and want to eliminate the dependency on WinSock2.

TWebConnection can抰 support callback functions. It initializes
SupportCallbacks to False in the constructor and never changes this value.

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