How to tell if a process started with CreateProcess is still running?

If I've got a process created through CreateProcess(), how would I determine if it's still running? I know I need to use pi.hProcess but I don't know how, and google isn't really giving me meaningful hints.

PROCESS_INFORMATION pi;
STARTUPINFO si;
ZeroMemory(&si, sizeof(si));
si.cb = sizeof(si);
ZeroMemory(&pi, sizeof(pi));
bool got_it=CreateProcess(NULL, CA2T(launchString.c_str()), NULL, NULL, false, NORMAL_PRIORITY_CLASS, NULL, NULL, &si, &pi);