Yoko

I'm looking for a command fot testing that player is reachable for casting spells or another action... Could you help or point me?

LOS - line of sight is original namein ultima world...

for example:
I'm running in back my opponent and casting An Ex Por (paralyze) first when I'll cast it I want check if opponent is still reachable and my cast will success...

LOS calculated by server using complex routines. they can be scripted, but not in public injection version.

the simpliest thing you can always check is only a distance to object, using uo.GetDistance(object)