process & threads

How can I get the Thread handle of a program X (like i have numbers.exe or notepad.exe) and suspend it and later resume it?
 I have SuspendThread() function frm msdn. How can i tackle it.
To make things simpler i have this code below:

#include <windows.h>
#include <stdio.h>

//Program that creates a process
//This program assumes that numbers.exe is in the PATH!

int main(int argc, char **argv)
{
 PROCESS_INFORMATION pi;       /* filled in by CreateProcess */
  STARTUPINFO si;               /* startup info for the new process*/

  printf("Process %d reporting for creation\n",GetCurrentProcessId());
  GetStartupInfo(&si);

  /* Call CreateProcess, telling it to run an exe file
     with lots of defaults... (the NULLs mean "use defaults")
       "\"F:\debug\numbers.exe\" -L",
  */

CreateProcess(NULL,                  /* lpApplicationName */
"numbers.exe",           /* lpCommandLine  assumes to use curent process directory*/
NULL,                              /* lpsaProcess */
NULL,                              /* lpsaThread */
FALSE,                              /* bInheritHandles */
CREATE_NEW_CONSOLE,     /* dwCreationFlags */
NULL,                              /* lpEnvironment */
NULL,                              /* lpCurDir */
&si,                              /* lpStartupInfo */
&pi                                    /* lpProcInfo */
     );

  /* print out the new process iD and quit
     (does not wait for new process to exit!)
  */
  printf("New Process ID: %d ",pi.dwProcessId);
  printf("has started \n");
 
       DWORD SuspendThread(HANDLE /*hThread*/
//                              );
//       GetLastError(void);


  return(0);
}

Pliz Assist
Thanx