IIRC, that radius is 600, but I don't have sources for that. This unit can be in a defined radius of the hero. "commands" (it is not defined in the page) - I think this means that the hero is actively engaged in combat along with unit in question. That is why you creep with just one hero if heroes are of different levels. Warcraft III: The Frozen Throne (sometimes abbreviated to TFT) is an expansion pack of Warcraft III: Reign of Chaos developed for Microsoft Windows, Mac OS and Mac OS X by Blizzard Entertainment. This is worse than if only the lower leveled one of them got the experience (100*70% = 70 vs. Hence, if you are supposed to get 100 exp, which is to be shared between 2 heroes of level 2 and 3, they will receive 50*70% = 35 and 50*62% = 31, respectively. When getting experience from a creep, the hero only gets a percentage of the XP that he would have received had the hostile unit not been a creep, depending on the hero's level.
If multiple heroes are commanding a unit that makes a kill, then the XP is split evenly.
If you have multiple heroes, a hero gains experience when he or any unit under his "command" kills a hostile unit.If you have only one hero, he gains experience for creeps killed no matter where he is on the map.