Differences between STDVCL32.dll and STDVCL40.dll.

Hi,

Can someone plese tell be the main differences between STDVCL32.dll and
STDVCL40.dll files.  In Delphi 4 help it gives me some of the enhancements
in stdvcl32 over stdvcl40....but if any of you have come across anything
else please let me know.  Thanks in advance for you help.

Uday