Hey Moe, did you get the code from ch4 to work? I''ve had problems with the timer stuff. Everything builds but I get linker warnings and the .exe gives me error messages. In case you or anyone else is wondering what I''m talking about, here''s the code: /* WinMain (application loop) */ int APIENTRY WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance, LPSTR lpCmdLine,int nCmdShow) { //locals MSG msg; BOOL notDone=TRUE; //and stuff for the timer LONGLONG cur_Time; DWORD time_Count=16; LONGLONG perf_Cnt; BOOL perf_Flag=FALSE; LONGLONG next_Time=0; LONGLONG last_Time=0; double time_Elapsed; double time_Scale; //initialize app, exit on failure if(!initApp(hInstance,nCmdShow)) /**/ { Cleanup(); /**/ return FALSE; } //is there a performance counter available? if(QueryPerformanceFrequency((LARGE_INTEGER *) &perf_Cnt)) { perf_Flag=TRUE; //next line gets linker error //warning C4244: ''='' : conversion from ''__int64'' to //''unsigned long'', possible loss of data time_Count=perf_Cnt/60; QueryPerformanceCounter((LARGE_INTEGER *) &next_Time); time_Scale=1.0/perf_Cnt; } else { //no performance counter, read in using timeGetTime() next_Time=timeGetTime(); time_Scale=0.001; time_Count=33; } //save time of the last frame last_Time=next_Time; //the loop while(notDone) { if(PeekMessage(&msg,NULL,0,0,PM_REMOVE)) { if(msg.message==WM_QUIT) notDone=FALSE; TranslateMessage(&msg); DispatchMessage(&msg); } else { //use appropriate method to get time and //calculate elapsed time since last frame if(perf_Flag) QueryPerformanceCounter((LARGE_INTEGER *) &cur_Time); else cur_Time=timeGetTime(); //time to render frame? if(cur_Time>next_Time) { time_Elapsed=(cur_Time-last_Time)*time_Scale; last_Time=cur_Time; //move the screen position xpos+=move_Rate*time_Elapsed; if(xposMAX_POS) { xpos=MAX_POS; move_Rate=0; } //render the frame renderFrame(); /**/ //set time for next frame next_Time=cur_Time+time_Count; } } } //exit returning final message return(msg.wParam); } /* WinMain */ The problem is with this line: time_Count=perf_Cnt/60; Thanks in advance for any help. "A man can't just sit around." 'Lawn Chair' Larry Walters (1982)