String principalName = "MyCacheServer";
 connection_properties.put("service principal name",principalName);

// Given a connection called "conn"
if (conn->is_two_factor_enabled()) {
  // Prompt the user for the one-time security token.
  // Store the token in the "token" variable of type std::string.
  Conn_err err;
  if (!conn->send_two_factor_token(token.c_str(), &err;))
      // Process the error from a invalid authentication token here.
} 

// Given a connection called "conn"
if (conn.isTwoFactorEnabled()) {
  // Prompt the user for the two-factor authentication token.
  // Store the token in the "token" variable.
  try {
    conn.sendTwoFactorToken(token); 
  } 
  catch (Exception ex) {
    // Process the error from a invalid authentication token here.
  }
}

// Given a connection called "conn"
try {
  if (conn.isTwoFactorEnabledOpen()) {
    // Prompt the user for the two-factor authentication token.
    // Store the token in the "token" variable.
    conn.sendTwoFactorToken(token);
  }
}
catch (Exception ex) {
  // Process exception
}

// Given a connection called "conn"
SQLINTEGER stringLengthPtr;
SQLINTEGER attr;  
SQLRETURN rc = SQLGetConnectAttr(conn, 1002, &attr, sizeof(attr), &stringLengthPtr);
if attr {
  // Prompt the user for the two-factor authentication token.
  wstring token;
  SQLRETURN rc = SQLSetConnectAttr(conn, 1002, token, SQL_NTS);
    if !rc {
      // Process the error from a invalid authentication token.
    }
} 

// Given a connection called "conn"
if ($conn->is_two_factor_enabled()) {
  # Prompt the user for the one-time security token.
  # Store the token in the "token" variable of type std::string.
  if (!$conn->send_two_factor_token($token)) {
    # Process the error from a invalid authentication token here.
  } else {
    # two-factor authentication succeeded
} 
else {
  # Handle if two-factor authentication is not enabled on the server.
}

// Given a connection called "conn"
if conn.is_two_factor_enabled():
  # Prompt the user for the one-time security token.
  # Store the token in the "token" variable of type std::string.
  # Make sure that the carriage returns are stripped from the string.
  if !conn.send_two_factor_token(token):
    # Process the error from a invalid authentication token here.
  else:
    # two-factor authentication succeeded
else:
  # Handle if two-factor authentication is not enabled on the server.

 set success = $SYSTEM.Security.Login(username,password)

 set success = $SYSTEM.Security.Login(username)

WHILE ConditionToTest {
    IF SomeThingToStart {
        DO Start(Routine, User)
    }
}

Start(Routine, User) {
    NEW $ROLES    // Preserve $USERNAME and $ROLES

    // Try to change username and roles
    IF $SYSTEM.Security.Login(User) {
        JOB ...
        QUIT $TEST
    }
    QUIT 0       // Login call failed
}