Unions of ASSIGNed arrays in state notation?

[Ron Chestnut <RON@slc.slac.stanford.edu>]

I'm using lots of waveforms to map to arrays for a PEP-II application 
here at SLAC. There are two basic modes I have to deal with, each 
using different size arrays and waveforms. To simplify code in 
subroutines called by the state program, I'd like to do the 
following:

Union
{
  long Array_1[100];
  Struct
  {
    long Array_2[77]; long Pad [23]
  } _S
} _U;

Then

Assign _U.Array_1 to "wf1";

Assign _U._S.Array_2 to "wf2";

Were this possible, I could have all the mode dependent stuff around 
the PVPUTs, instead of scattered about.

Before I begin experimenting, can a state notation guru please give 
his nickel's worth?

/Ron Chestnut