Owing to the very high rate charm production can be studied at 3-4 different
energies (100 - 450 GeV/c) using 2-3 different projectiles ( 
, K, p).
No other single experiment has yet performed such a systematic investigation.
E781 will produce cross section measurements for and 
at 600 GeV/c. It is not clear, how well they will do on charm correlation due
to the limited acceptance at low values of Feynman x.
We thus feel that no direct competition has to be discussed in this field.