Understanding the trace file format

Hi,

I am trying to write my own utility which can read the trace file generated
by SQL Server.
I am able to interpret most of the binary data in the trace file.

But still I am having some problems in interpreting some binary values which
are there at the beginning of every trace file. These values are
FFF4,FFFD,FFFA,FFFB,FFFC.


I am able to interpret FFF6 which is used specify the beginning of a event.

If some one have any knowledge about these values then please help me out.

Thanks in advance.

Pushkar