SetProperty

Abstract AS2

@t0 = @pop();
@t1 = @pop();
@pop()[@propertyName(@t1)] = @t0;

Adobe documentation

ActionSetProperty

ActionSetProperty sets a file property.

FieldTypeComment
ActionSetPropertyACTIONRECORDHEADERActionCode = 0x23

ActionSetProperty does the following:

  1. Pops a value off the stack.
  2. Pops an index off the stack.
  3. Pops a target off the stack.
  4. Sets the property enumerated as index in the movie clip with the target path target to the value value.