No, it doesn't use 'open' and 'closed' terminology - that's a RS convention that's used with GRE produced scanners. The PRO-94 is
almost a Uniden BC245 (in fact it was made by Uniden) in many ways - I've programmed a few for people, and many of the same tricks the 245 has works on the 94. It's a very easy scanner to program.
Terminology in this game is important - when you say that it 'automatically finds the DEC numbers', I suspect what you are really saying is that it's hearing every talkgroup on your system. This is true when the scanner is in
ID Search mode - you need to put it into
ID Scan mode. If you've already put in the talkgroups you want to hear, pressing SCAN while in that bank should switch you right over.
The manual is quite easy to read, frankly, but here's the Easier to Read version - I'd download it if you find it easier to understand...
Note that there are 2 versions - the original PRO-94, then there's one for the 94A and B. The manual will tell you how to tell the difference...(anything in blue is a link)
Easier to Read Pro-94A/B Scanner Manual
Easier to Read Pro 94 Scanner Manual
best regards..Mike