You'll also need a good firewall to keep out intruders.

The iron gate which will keep out intruders bears the symbol of the double helix.

His rear sliding door features a backup grille style door (the kind found in shopping mall stores) to keep out intruders.

This meant that attendants could greet passengers on arrival, and it helped to keep out intruders.

They are bounded by security walls to keep out intruders.

Using the simple power of the sun, this solar light will welcome your guests and alarm potential intruders.

Once set up, it can help prevent potential intruders from accessing your computer.

Welcome your guests and alarm potential intruders with this solar welcome light.

The entryways were purposefully made small, so that potential intruders would be quickly subdued by guards in a watch tower near the entrance.

Initiating can make you an unwanted intruder.

Unfortunately, they will never accept her as one of their own, treating her as a peculiar and unwanted intruder.

The first hedges were remnants of the primeval forest — early farmers left trees around a woodland clearing as a simple boundary, keeping farm animals in and unwanted intruders out.

The main uncertainty was whether the viruses could cross the blood-brain barrier, a membrane that protects the brain against unwanted intruders.

A green woodpecker emitted its sharp, quacking alarm call as it saw off two unwanted intruders, a buzzard and a red kite.

Yet modernity was in places an unwelcome intruder.

But when there's some really unwelcome intruders on the premises?

It's easy for us to view trials as unwelcome intruders in our lives.

It sprays unwelcome intruders and gives them a fright.

The last two and hawthorn also carry thorns as a barrier to deter unwelcome intruders.

The door handles can be electrified to shock a would-be intruder.

Eventually, the would-be intruder left, and after 25 minutes someone from the security company arrived.

Sometimes these show the skull and crossbones, to frighten any would-be intruders.

Meanwhile, staff were asked to avoid sharing pictures of their passes on social media to prevent them being copied by would-be intruders.

The centre, which tracks attacks and worms by analyzing firewall records, indicated that would-be intruders are scanning companies for vulnerable systems, and when they find such systems, they attack.