He becomes the fourth Dutch coach at Barca following Johan Cruyff, Louis van Gaal and Rinus Michels.
Van Gaal will be looking to correct that in qualifying for the next World Cup in Brazil in 2014.
CNN: Van Gaal returns for second spell as Dutch national coach
"It's the challenge I have been waiting for, " said van Gaal as he gave his reaction on the official website.
CNN: Van Gaal returns for second spell as Dutch national coach
Heynckes is currently in his third spell as Bayern coach having taken over from Dutchman Louis van Gaal in 2011.
Gaal assured that the Karma hotspot uses the same type of Internet safeguards found in any open wifi at cafes and airports.
FORBES: How To Get Free Internet When A Stranger Uses Your Wi-fi
Just three lasted more than 12 months: Louis Van Gaal at Bayern Munich, Reynald Denoueix at Real Sociedad and Bert Van Marwijk at Borussia Dortmund.
WSJ: Pellegrini's Background Looks Good For Soccer's Manchester City
Bayern now face Maccabi Haifa in the Champions League on Wednesday with their qualification hopes hanging by a thread and van Gaal under more pressure.
"Van Gaal earned his spurs not only nationally, but internationally as well and we know him as a dedicated and highly driven coach, " van Oostveen added.
CNN: Van Gaal returns for second spell as Dutch national coach
Van Gaal has been out of the game since being sacked by Bayern Munich last year, having led them to the Champions League final in 2010.
CNN: Van Gaal returns for second spell as Dutch national coach
In the last two months Gaal said he has noticed that for every hotspot out there it is being shared with multiple people multiple times a day.
FORBES: How To Get Free Internet When A Stranger Uses Your Wi-fi
Van Gaal has established a reputation for tactical acumen and his ability to rebuild teams, but has a forthright approach and an often frosty approach to the media.
CNN: Van Gaal returns for second spell as Dutch national coach
Three weeks ago, Nigeria named a list of preferred candidates, and since then Louis Van Gaal, Guus Hiddink and Peter Taylor have all rejected the chance to coach Nigeria.
Later on Sunday, Bayern Munich eased a little of the pressure on coach Louis van Gaal with a 3-0 win over Hannover to move to fourth in the Bundesliga.
Gaal added that younger generations have become used to solving problems online and in this situation, they are solving the problem of not being able to get online in person.
FORBES: How To Get Free Internet When A Stranger Uses Your Wi-fi
Ribery then smashed home a stunning free-kick goal in the 64th minute and went some way to dispel rumors of a falling-out with Van Gaal by racing to celebrate with the Dutchman.
Bayern coach Louis van Gaal replaced Gomez with Franck Ribery in the second half, and the Frenchman was involved as Bastian Schweinsteiger made it 2-1 with a low shot from outside the area.
Louis van Gaal had said before the game that his job as Bayern coach was on the line and his side's fourth draw at the Allianz Arena this season hardly improves the Dutchman's position.
Coach van Gaal felt Bayern could have won by more goals as they went a point clear of Bayer Leverkusen who will return to the summit with a draw or better against Hoffenheim on Sunday.
In addition to the aforementioned Van Gaal, Robson and Hiddink, you also have the likes of Giovanni Trapattoni (Bayern), Dick Advocaat (Borussia Moenchengladbach), Cesar Menotti (Sampdoria), Luiz Felipe Scolari (Chelsea) and Carlos Bianchi (Atletico Madrid).
WSJ: Pellegrini's Background Looks Good For Soccer's Manchester City
It sees the Bavarian giants slip to eighth in the Bundesliga and to add to van Gaal's woes, reports in Germany said star striker Luca Toni had driven home after being substituted at half time at the Allianz Arena.
The 32-year-old Italian international has struggled to hold down a place at Bayern under new coach Louis van Gaal and is keen to secure regular football in a bid to force his way in Italy coach Marcello Lippi's World Cup plans.
He worked with Guus Hiddink, Frank Rijkaard, Louis van Gaal and Dick Advocaat at three World Cups and three European Championships with Netherlands, Russia and Korea, as well as with the Korean national team at the 2010 World Cup finals in South Africa.
However, Inter will argue they deserved their slice of luck, and the match-up of Mourinho against Bayern boss Louis van Gaal, one of the men under whom he served his apprenticeship at Barca, provides a fascinating back-drop to what will be an hotly-contested final next month.
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