IStream

type IStream = interface(ISequentialStream) end;

  function Seek();

Set the stream position

  function SetSize();

Set the stream size

  function CopyTo();

Copy data from one stream to another

  function Commit();

Commit data to the stream

  function Revert;

Revert changes

  function LockRegion();

Lock a region of bytes in the stream

  function UnlockRegion();

Unlocks a previously locked region of bytes in the stream

  function Stat();

return information about the stream.

  function Clone();

Clone the stream instance

IStream

COM stream abstraction

ISequentialStream

Sequential stream object interface

IUnknown