Bercon PFlow +
Modified Spawn and Collision Spawn operators for maxscripters. Both store the particle ID of their parent to spawned particles Integer channel. In addition to this the modified Collision Spawn test also stores the normal vector of the object at the impact point into Vector channel.
Install: Download the file, unpack it, select the correct plugin file and move it to your …/3dsmax/plugins/ folder. (Max 9 and 2008 use the same files)