Ye' old general discussion board. Basically, for everything that isn't covered elsewhere. Come here to shoot the breeze, shoot your mouth off, or whatever suits your fancy. This forum is not for asking programming related questions.
GTK is a toolkit for making GUI apps. In other words, it is the API that lets you program graphical programs - you tell it where to put buttons, windows, boxes, etc, and it handles the nitty-gritty for you. to make an exe with it, you normally would use C and gcc to compile the program. with php-gtk though, you run the code through the php cgi program (i believe).
PS Is that understandable or too technical? I can't tell anymore...need sleep...
nope, gtk is just a set of protocols for designing GUIs. your friend will need to have the php interpereter - PHP (to my knowledge) can't ever be compiled to .exe.