Hi, Everyone: Now I am reading the document of Building Infrastructures for DROPS Tutorial. And in the server side the code is like this: #include <stdio.h> #include <l4/names/libnames.h> #include "hiworld-server.h" char LOG_tag[9]="hiserver"; static int count; void hi_print_component(CORBA_Object _dice_corba_obj, CORBA_Environment *_dice_corba_env){ printf("Hi world\n"); count++; } int hi_count_component(CORBA_Object _dice_corba_obj, CORBA_Environment *_dice_corba_env){ return count; } int main(void){ if(names_register("hiworld")==0){ printf("Error registering at nameserver\n"); return 1; } hi_server_loop(0); } In the main routine there is function named hi_server_loop. But I don't where is the function definition. i checked the hiworld-server.h and there is no definition. ths chenggh