thx,

thopught i understand it so i havent done it step by step so
now i changen the main.c and it freezes after i clicked ok when it says that it will close after 3 mins because i use the demo.

main.c
Code:
#include <acknex.h>
#include <anet.h>
#include <default.c>
#include <windows.h>
#include <ackphysx.h>
#include <main.h>
#include <kotu_network.c>

function PhysikIntialise()
{
	physX_open();// für Physik !

	pX_setgravity(vector(0,0,-9));
}

function main()
{	
	PhysikIntialise();
	var i;
	fps_max = 60;
	mouse_mode 		= 0;
	video_mode 		= 8;
	video_screen 	= 0;
	

	
	//for(i=0;i<4;i++) {players[i] = 0;}
	level_load("media/levels/shooter.wmb");
	
	while(!key_any)
	{
		wait(1);
	}
	
	/*if(key_s)
	{
		inkey_playername_text.flags |= VISIBLE;
		inkey(playername_input); 
		inkey_playername_text.flags &= ~VISIBLE;	
		enet_initialisieren();
		start_server();
		wait(4);
		start_client(_str("127.0.0.1"));
	}
	else
	{
		inkey_playername_text.flags |= VISIBLE;
		inkey(playername_input); 
		inkey_playername_text.flags &= ~VISIBLE;	
		enet_initialisieren();
		start_client(_str("127.0.0.1"));	
	}
	while(1) 
	{	
		mouse_pos.x = mouse_cursor.x;
      mouse_pos.y = mouse_cursor.y;
      camera.pan -= mouse_intens*mouse_force.x;
      camera.tilt += mouse_intens*mouse_force.y;
      if(camera.tilt > 90 )
      {
      	camera.tilt = 90;
      }
      if(camera.tilt < -90)
      {
      	camera.tilt = -90;	
      }	

      
      wait (1);	
      	
	}*/
	sys_exit("123");
}


so it don't load the level, so i think there is no problem with anet, but with the alert of the demo or my pc.