Saudi men earlier had the option of requesting alert messages about their dependants' cross-border movement, but it appears that since last week such notifications are being sent automatically.
The Syrian army has also boosted its presence along the previously unpatrolled Lebanese border, to stem the movement of people and weapons from loosely-policed Lebanon.
It led to Paris introducing temporary border controls, suspending the free movement of people as guaranteed under the Schengen agreement.
This in turn might lead the Sudanese government to renew its support for the Lord's Resistance Army (LRA), a bizarre cross between a religious cult and a rebel movement based across the border in northern Uganda, which abducts children and makes them attack Ugandan government forces and civilians.
As the countries south of the United States border have become less brutal, the movement has faded.
Before the latest row, Pakistan had revived the idea of fencing and mining the 2, 500km (1, 560 mile) border with Afghanistan, ostensibly to restrict the movement of Taliban fighters.
"There have been concerns about the thefts, illegal movement and identification of livestock in border areas and a suspicion that the stolen animals were being moved across the border from both sides into the other jurisdiction, " he said.
The movement's main base is over the border in northern Iraq, where Iraqi Kurds run their own region.
The European Commission allowed temporary re-introduction of border controls, in breach of the Schengen convention of the free movement of people.
Reports have also emerged that a senior figure in the main militant Islamist movement - Ansar Dine - has been captured near the Algerian border by a rival separatist group.
And then you have the local people who live there, many of whom are Pashtun, they belong to tribes that straddle the border, they don't want to see it walled and their freedom of movement restricted.
Around the time of the Abbasid dynasty, cross-border trade became extremely active in the Islamic world with merchants acting as mediators for the movement of goods among western and African countries, India, and (later) China.
The secretary of state urged Lebanon to stop the activities of Hezbollah guerrillas on the border with Israel and he called on Syria to end its support for the Iranian-backed movement.
But early this year, an Albanian guerrilla movement started to grow and to arm itself, using bases on both sides of the border with Kosovo.
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