Handle Limitations
Some objects, such as user and GDI objects, support only one handle at a time.
The system provides the handle when an application creates the object and
invalidates the handle when the application destroys the object. Other objects,
such as some kernel objects, support multiple handles to a single object. The
operating system automatically removes the object from memory after the last handle
to the object is closed.
The total number of open handles in the operating system is limited only by
the amount of memory available to the operating system. However, a single process
may have no more than 16,384 open GDI object handles. The per-process limit on
kernel handles is 2^30. There is no per-process limit on user handles, but
there is a systemwide limit of 65,536.
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