When running php-gtk using php-win on windows, and launching external application from within php-gtk, one will always see a brief flashing of a cmd window.
For those interested, I've posted a solution which we have been using for some time at:
http://www.kksou.com/php-gtk2/articles/launch-external-app-in-winxp-without-the-flashing-of-cmd-window.phpIt basically make use of a freeware utility called cmdow utility from
http://www.commandline.co.uk/cmdow/ that allows you to hide a command window. We find this a great tool for interfacing php-gtk with external applications, e.g. open a url in browser or playing a mp3 file using an external player.
/kksou