Hash/Frame
If you require separate global vars for multiple instances of a routine, you can 
use Frames.  See SpriteMeshEd(), ::/Demo/Graphics/Pick3D.HC or Noise().

FramePtr            Funct Find entry in task->hash_table, Return user_data.
FramePtrAdd         Funct Add named value to task->hash_table.
FramePtrDel         Funct Remove entry and delete.
FramePtrSet         Funct Find hash entry in task->hash_table. Change user_data0.