Turnpoint descriptions

While working recently on a Java program to combine and geographically
filter turnpoints from multiple .CUP files, I noted that when I use SeeYou
to convert from .CUP to .DA4 (for Filser/LX Nav products) format, the
turnpoint names get truncated to 8 characters and all uppercase. This
presents name collisions for pairs of turnpoints with verbose names like
"Black Canyon North" and "Black Canyon South" -- both get saved with the
name "BLACK CA", which causes LXe to complain when the file is loaded
therein.

Is there a "standard" somewhere for what data are contained in turnpoints
and how they are named? I know .DA4 files are used for LX Nav products; what
are .CUP files used for (besides SeeYou)?

thx/2NO