Originally posted by Nephthys
No-one/just one has actually shown to be able to use the portkey spell. Going by forum rules of 'only feats shown in the movies apply' no-one/just one can use the portkey spell. And they can't turn the ground into a portkey, unless RJ wants to argue that they can turn the entire ****ing earth into a portkey.Jesus Christ I can't believe I was the only one who remembered this.
The only other argument for Hogwats I saw was the invisibility-cloak Harry and Bellatrix flying around pwning. This wouldn't work, Vader would know where they were and pimp them.
Nice try, but portkeys are shown in the movies, and wiki is a creditable source here, it's in the forum rules.
Doubtful one portkey would cover the planet, which is why several overlapping portkeys would be used.
Portkeys can be made of anything, and it is never implied that there are any size limitations.
Dumbledore is the most powerful wizard alive, he and Voldy 1 and 2, and Dumbledore can create them, so surely Voldemort can to. Check this out:
http://en.wikipedia.org/wiki/Portkey#Portkeys
[edit] Portkeys
The Portkeys are first mentioned in Goblet of Fire. Once created by using the Portus spell, a Portkey can be set to transport anybody who touches it to a designated location, or to become active at a pre-determined time and transport to that location anybody who happens to be touching it at the moment of activation. They may also be set up for one-way, one-time use, or to transport the holder to and from a particular place in a round trip. The creation of Portkeys may be highly restricted in general: Cornelius Fudge is upset that Dumbledore would create one in front of him, from the head of the wizard depicted in the Fountain of Fair Fortune, and at one point Lupin says "...it's more than our life's worth to set up an unauthorised Portkey."
In the series, a Portkey is usually made from an unobtrusive object or bit of rubbish, to prevent Muggles from discovering their magical nature. When activated, the user feels a pulling or jerking sensation behind the navel, and then suddenly appears at the destination.[HP4] With enough practice, a graceful landing is possible: after the Portkeyed trip to the Quidditch World Cup in the fourth film, Mr Weasley, Cedric and Amos Diggory landed on their feet, while Harry, Ron, Hermione, Ginny and the twins fell onto the ground.
In Goblet of Fire, Crouch Jr., who was impersonating Moody, made the Triwizard Tournament cup a Portkey so it would transport anybody who touched it straight to the hands of Voldemort, expecting it would be Harry. However, Harry took the cup together with Cedric, so Pettigrew murdered Cedric.
And:
http://harrypotter.wikia.com/wiki/Portkey
Portkey
Object information
Manufacturer Witch or Wizard using the Portus charm
Made By using Portus on any object
Usage Transports people to a pre-determinated destination
First appearance Harry Potter and the Goblet of Fire
Latest appearance Harry Potter and the Deathly Hallows
So yeah, portkeys can be created by Dumbledore, Voldemort, probably Arthur Weasley and the OOTP members.