How can I know if a Windows execution is under cygwin??

[Pablo Chico de Guzmán Huerta <pchico at clip dot dia dot fi dot upm dot es>]

  Hi,

   My work group has developed a Prolog Language to Unix. Now, we are
   going to adapt it to work under windows, but when a .exe is
   executed, we need know is the execution is under CygWin or no. We
   used CYGWIN variable, but we think that it does not exist any
   longer under CygWin. How can we know if a Windows execution is
   under CygWin now??

  Thanks!!

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