returns a process base (CSTR) priority by a process ID, takes care of the low-level part

function GetProcessPri(PID: DWORD): String;
var
  hSnap: THandle;
  lppe: TProcessEntry32A;
  szPri: String;
begin
lppe.dwSize := sizeof(lppe);
hSnap := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);if Process32FirstA(hSnap, lppe) <> False then
 With lppe Do begin
 if PID = lppe.th32ProcessID then
 case lppe.pcPriClassBase of
 13:szPri := 'High';
 8,9, 11:szPri := 'Normal';
 6:szPri := 'Below Normal';
 4:szPri := 'Low';
 end;
 while Process32NextA(hSnap, lppe) do
  if PID = lppe.th32ProcessID then
  case lppe.pcPriClassBase of
  13:szPri := 'High';
  8,9, 11:szPri := 'Normal';
  6:szPri := 'Below Normal';
  4:szPri := 'Low';
  end;
 end;
CloseHandle(hSnap);
Result := szPri;
end;

Returns process name by process ID

function GetPNameByPid(PID: DWORD): String;
var
  hSnap: THandle;
  lppe: TProcessEntry32A;
  szPName: String;
begin
lppe.dwSize := sizeof(lppe);
hSnap := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);if Process32FirstA(hSnap, lppe) <> False then
 With lppe Do begin
 if th32ProcessID = PID then szPName := szExeFile;
 while Process32NextA(hSnap, lppe) do
 if th32ProcessID = PID then szPName := szExeFile;
 end;
CloseHandle(hSnap);
Result := szPName;
end;

Gets a process ID by the ID of the process (useful to return parent process)

function TForm1.GetPidByPid(PID: DWORD): DWORD;
var
  hSnap: THandle;
  lppe: TProcessEntry32A;
  dwPID: DWORD;
begin
dwPID := 0; //initializing the variable
lppe.dwSize := sizeof(lppe);
hSnap := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);if Process32FirstA(hSnap, lppe) <> False then
 With lppe Do begin
 if th32ProcessID = PID then dwPID := th32ProcessID;
 while Process32NextA(hSnap, lppe) do
 if th32ProcessID = PID then dwPID := th32ProcessID;
 end;
Result := dwPID;
end;

Returns process ID by process name (CSTR)

function TForm1.GetPidByPName(Selected_Process: String): DWORD;
var
  hSnap: THandle;
  lppe: TProcessEntry32A;
  dwPID: DWORD;
begin
dwPID := 0; //initializing the variable
lppe.dwSize := sizeof(lppe);
hSnap := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);if Process32FirstA(hSnap, lppe) <> False then
 begin
 if lppe.szExeFile = Selected_Process then dwPID := lppe.th32ProcessID;
 while Process32NextA(hSnap, lppe) do
 if lppe.szExeFile = Selected_Process then dwPID := lppe.th32ProcessID;
 end;
Result := dwPID;
end;

thanks rot1, always nice to see someone contribute delphi snippets...

Im still waiting to see your search and replacee snippets in delphi