Thread Synchronization
with the VCL
In multi-threaded applications that need to update the user
interface, you
cannot access to properties of visual components (or in
memory-objects)
that are part of the global thread without a synchronization
mechanism.
The VCL, in fact, in not thread-safe (as is true for most
user-interface libraries).
Two threads accessing an object at the same time could compromise
its
state.
在一个多线程的需要更新用户界面的应用程序中，如果没有同步机制的话，你将不能访问是全局线程的一部分的可视组件的属性（或在内存的对象）。