From the API wiki: https://wiki.roll20.net/API:Utility_Functions#Miscellaneous
sendPing(left, top, pageid, (optional) playerid, (optional) moveAll)
Sends a "ping" the tabletop (the same as if a player holds down their mouse button). You must specify the top/left coordinates, and the pageid of the page to be pinged. You can optionally specify the ID of a player who performed the ping -- if you don't "api" will be assumed and the ping will be yellow. You can also pass in "true" for the moveAll option if you want to move the player's screens to that location as well.
This does not currently function as advertised, only the GM is moved to the sendPing location, and not even every time the function is called. This would be extremely helpful for GMs wishing to split the party or make use of the teleporter scripts. Specifically, I need to be able to target individual players with this script to move only those players to the pinged location.
See below for full history of this bug/suggestion.
This API bug has been referenced multiple times in different suggestion threads, as well as having been broken since the original API release.