UCM coding

Hi guys,

I've looked all over the internet for some documentation regarding the writing of UCM files, but alas, I cannot find anything!

We're currently using MicroStation SE, so I believe the best (if not only) way of having this coding, is to use the UCM files.

Does anyone have any documentation or user guides for writing or understanding UCM coding? I'm currently trying to work out what APCOLS, APTSCL, FBFDCN, CUGRAF and NULCMD all mean.

Any help would be gratefully received, as this is becoming a bit of a pain!