When I use session (a php session or another application server
  session manager), and I call a include function, in this call to another
  file (other PHP file or servlet), PHP losts the session cookie.

  I sniff the packets between the application server an the apache
  web server and I test it.

  What can I do??.

  I think that another function of PHP must leave pass the HTTP headers
  to propage sessions (or another cookies).

  I've tried to modify PHP source (create another include function), but
  it's very difficult.

thanks, in advance
Justo.