Hero flag
From Guild Wars Wiki
Heroes can be directed in explorable areas through the use of the flag buttons beneath the compass. This function only works for heroes you currently control, and usually does not extend to directing other party member's heroes.[edit] Moving heroes
A player can only direct heroes that they control. A player can direct another party member's heroes under special circumstances. Underneath the compass, there are a set of four flags and a cross icon. To set a destination for them, left-click once on a flag, and then click on the location you wish your hero to go within the compass, the Mission map (default key 'U') or any terrain visible in front of the player. Your heroes will then run to that destination. Double-click the same button can remove the destination flag. When you remove a destination flag for a Hero or henchman, that NPC no longer walks to that location; instead, the NPC returns to your location.
The first flag (shown as a green flag with three dots) sets a common destination for all of your heroes and henchmen. Setting this flag will cause all your heroes and henchmen to move at the same time, unless they have a flag of their own currently set. The other three flags (shown as a green flag with the number 1, 2 and 3 next to it) allows players to individually control heroes. Party window and Hero control panel show what number each hero is, and each number corresponds to one of three numbered flags. The cross icon will remove all flags and the heroes will return to the player.
A hero will run to the destination that the flag has been placed, often navigating the shortest path to the destination themselves. Occasionally a hero will become caught on an object or the terrain and will cease movement. You will need to reposition the flag to move the hero, or place a secondary checkpoint before flagging them to their intended destination.
[edit] Notes
- If a player controlling a hero leaves the game, the next person in the party will control the hero's movement from that point on. If the player currently has three heroes, the new hero can only be controlled using the first flag.

