Checking if a program in path

[Colossus <colossus 3000 it>]

Hi,

I'm building an app with the GTK for the first time,
I'm just moving the first steps. I need to know if
a program is available, so I thought to try open the
file with the -e flags, but maybe there is already something
inside glib ??
--
Colossus

Cpsed, a Linux OpenGL 3D scene editor
http://cpsed.sourceforge.net/