Yes! Finally got UQM builded under VC6++(haven't compiled anything ever).  Changed some star coordinates (Sirius and A Mira) and got completely new systems! Also change B mira to green and got a new system as well (interesting...). I have written a program to autochange coordinates, but its on 1C (internal lang), and I don't know any external lang well enough. My friend suggest to learn Perl a liitle, have to think about it. A programm must also ensure that accending order on Y on coord. will remain (else you get error in UQM).
Anyway, thanks again everyone for support, especially Meep-eep.

Oh, almost forgot! Death_999, are you still writing technical FAQ on UQM? i 'll  definetly be glad to use it, 'cause now i have only faint ideas of "how to compile, add content and run all that stuff on W98".

Now making head & tale from generation chain. Think that if I undestand way of calculation number of planets & moons, it is possible to alter random.c  and ajust critical planets locations to change universe, yet not get in situation you refer to, Meep-eep (about device in system not apearring 'cause there aren't enough planets ).
And looks like yes, changing X and Y just by 1 can drasticaly change system content.
Will be digging 4 next holidays, BIG THANKS to Meep-eep and Death_999 for support  ))

Death_999: That was the first thought after reading Fred explanation about generating, and I'm afraid will be the only solution. But to change star locations will result in starmap.c (copyright check) not working. If coordinates will be changed by X+1 (0,1 on chart), is that enough for completely new universe or not? What do you think?
My friend promised me to lend some books on C, so I gonna dig into code once more (still doesn't understand how seed & pseudo-random generation work).

Oops, sorry, found out myself. It REALLY generate Systems, so I understand now. What I don't understand is HOW TFB_Random can give needed results for placing Energy Devices on right planet? I try to look at the code more, but explanations are heartily welcome!

Meep-eep, thanks for answer. i looked at the code and figured it out too (about modif. Random.c). I looked more at various GEN???.c files that generate all plot-critical events. Looks like GenerateIP() in charge for generating planet (more likely) or sustem. If Planet, then changing Random.c can only results in misplaced energy devices in different location on the same planet (no worries!). Am I right?

Hello!  I'm a new on forum, 9 years in SC2, just love planet&galaxy exploration, and got a question:
As far as I can understand (I don't know C or C++ ), star chart is set in plandata.c, and acording to Fred Ford, number of planets/moons and minerals location on each generated on the seed of star destination. So they are, in fact, fixed.
The question is, how can I randomize them? Must I change star chart a liitle? Yes, I seached the forum, and still doesn't understand that. Dear ALL, answer to me please.