The trek to Triund starts from Gallu Devi temple, where people going for this trek are first asked to register their names. From Mcleodganj, a person first must reach Dharamkot via auto or you can simply get a cab straight to Gallu Devi temple. There is a small route via Dharamkot which leads straight to Gallu Devi temple in case a person wants to save up on the cab charges.
The trek mostly is a straight route up to Triund. The distance is 9 kilometers and usually takes about 4-5 hours. On the way there are only 3-4 small cafe shops that serve usual things that a trekker might need like eatables, water etc. but that too at rates more than Mcleodganj. The scenic beauty on the way is quite absorbing, provided it does not get cloudy. Tents are usually available up there at Triund at nominal rates.
The reason it called Triund is because of the 3 mountains that a person can see from that point. These 3 snow covered mountains are usually snow capped through out the year, so Tri means three and Und means mountains. There is no provision for electricity and toilets up there and the mobile signals are hard to find. After it gets dark, the torches come handy. The stars present a magnificent view at night. There is a guest house of Himachal Tourism and a person also has an option to stay there, provided the booking is done prior to the trip. More information can be found out on Himachal Tourism's website.