Chambers of commerce on both sides of the border are pushing hard for trade liberalisation.
Once capital controls were in place Europe's financial markets would be in tatters and it would be hard to preserve cross-border European trade.
The outcome of a key debate on whether the party should in future be prepared to enter into a coalition government South of the Irish border is also hard to predict.
And to see after all how the public will react with their vote to the illegal immigration issue, you know, especially the Republicans continue with this very hard strategy to close the border and to continue to fulfill the ideas of have a strong laws against illegals in any of the 50 states.
"I think an important message that this case sends is that it shows the determination of China and the governments of relevant countries to work hard together to combat cross-border crime, " Hua Chunying spokesman for China's foreign ministry said.
Wild boar that have lost legs to landmines can be seen hobbling out from the forests, and when two gorals face each other from either side of the border fence it is hard to tell which one is in the safest area.
CNN: Beyond the barbed wire: the accidental paradise of the DMZ
Since animals and beef normally move freely across the border, that would be hard.
Canadian officials do not expect their American counterparts to push hard for free trade or unsnagging the border.
They also may scramble their communications or run small hard drives or camera cards across the border to neighboring countries so that they can be uploaded, he said.
Mr. Maung Maung Win conceded that outside influence over the currency could be a problem, given Myanmar's many border crossings with neighbors, which make it hard to monitor capital flows.
Regulators are hard pressed to say for sure what has come over the border.
But it would be hard to enforce on social networks that prize their cross-border ties.
While Egypt has found it hard to block the tunnels, it has kept its official border with Gaza sealed to all but a trickle of humanitarian traffic, saying that the crossing's Palestinian side should be controlled by a proper government body, such as the PA, but not by Hamas.
When the Republicans ran Congress they rejected liberal immigration reform that George Bush supported and instead treated hard-working immigrants as criminals by funding security fences along the border with Mexico.
And no wonder that the Obama administration is looking for an exit plan from from the war in Afghanistan, which is hard enough to fight without having an exposed flank on the Pakistani border.
It's hard to see the Hume solution - joint referenda on both sides of the border on a deal, institutions at Stormont with safeguards for the minority, an acceptance of the principle of consent, and a promise of future referenda if the numbers game changes - being bettered.
More than 840 South Koreans were set to cross the border Monday to Kaesong, which provides a badly-needed flow of hard currency to a country where many face food shortages, according to Seoul's Unification Ministry.
The trickle of hard currency brought in by a few intrepid travellers helped buy food from across the border in Botswana and Zambia, and while some rangers sought work in other countries, a hardy band of guides stayed on to try and protect the animals from poaching.
John McCain, Arizona's senior senator, who faces a primary challenger running hard against illegal immigration, dropped his reform ideas and joined the calls to secure the border first.
But such limits might be hard to square with the principles of the European single market, which is meant to encourage cross-border competition.
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