@verb #4:"controls_prop controls_property" this none this rxd #55
@program #4:"controls_prop controls_property" this none this
"who:controls_prop(what, propname)"
"Is WHO allowed to hack on WHAT's PROPNAME?"
prop_owner = property_info(args[1], args[2])[1]
return this == prop_owner || this.wizard || prop_owner in this.students
.