void ISystem::ShellExecute(const char *command, const char *file)
This gives insight on ShellExecute usage. For example, ShellExecute can launch a website or a word document in the client's default viewer.
vgui\ISystem.h must be included in the appropriate file.
void ISystem::ShellExecute(const char *command, const char *file); vgui::system()->ShellExecute(...);
command can have one of the following values:
Look here for more information on each of the commands.
file points to the local file or webpage you want to access.