Warps Array?
 

okay, maybe something like a warps array would be a good idea. This way, all the warps in the level could be accessed by NPCs. Maybe some variables like

Warpscount - Count of all the warps in the level
Warps[index].x - The x value of the warp
Warps[index].y - The y value of the warp
Warps[index].width - The width of the warp
Warps[index].height - The height of the warp
Warps[index].desx - The X-destination of the warp
Warps[index].desy - The Y-destination of the warp

And maybe a message code like

#d(index) - The destination level of the warp with (index)

Okay, post your ideas/comments/flames below :)

Flame