int _spawnlp( int mode, const char *cmdname, const char *arg0, const char *arg1, ... const char *argn, NULL );这一函数是怎么用的?如spawnlp(_P_NOWAIT,"Ppp","Ppp.exe",m_strTxt);这一一句话具体是什么含意,麻烦说来听听,这看msdn没弄懂,谢