the difference?If I insert the code that is called for when using SB, what does it give me ...as compared to not putting the code in? Will the progarm work? And what more do you get if you register the code with the author? And what other programs have to entered in the box? Does RW have to be inserted????MB

I'm no expert, but I think that you'll get the basic functionality with the unregistered version, but you won't have access to the full suite of "tweaks" that allow you to adjust such things as the weather and allow you to calibrate your sim controls far better than the default "joystick calibration".I have no experience of "SB" and "RW" so its possible that these may require a fully functioning copy of FSUIPC to work properly.Alastair

Correct. In its simplest form, FSUIPC is a facilitation program to allow code (whether it be gauges, utilities, modules or even full programs)to run with Flight Sim.Over time, the interface has grown to encompass all kinds of tuneable options that can be adjusted from within the FSUIPC menu system, and directly control some aspects of Flight Sim.As these are not required by the programs and utilities that use FSUIPC purely as an interface it is not necessary to have a registered copy of FSUIPC to make these things work, but the registration unlocks many, many other functions available through FSUIPC - joystick calibration, advanced weather, cloud and visibility settings, fixes for common FS problems, etc.A couple of examples includes the ability to map throttles to include reverse thrust on the controller, or key assignments unavailable through the standard FS menu system. Allcott

Thanks for expanding on my reply ! As I've always run with the registered version (since it became so) I was unclear as to what was unavailable for non-registered users.Alastair

Now, THAT has to be the best summary yet in the history of this excellent and indispensible module.Mike

I have learned well, grasshopper!It's the little things that FSUIPC does in its registered form that makes FS so much more enjoyable - I have a hotkey for alternating between QFE and standard pressure, as used in the Flight Levels. Silly FS makes provision for setting QFE by pressing the `B` key, but has no option for switching to the standard 1013 millibars used above 18,000 feet. DOH! FSUIPC fixes that, as well as providing a couple of pre-set zoom settings either side of the default 1.0, 0.75, 0.50x.What else? Oh yes, the hot key combo to re-set control to all engines. None of that E + 1 + 2 + 3 + 4 rubbish (whatever were the developers thinking!?) just good old Ctrl+Shift+E returns engine control to all engines, and keeps it there.! Makes manoeuvring around airports in creaky old DC-3's a much more manageable proposition.Allcott

Actually, FS2004 does switch between QFE and standard pressure using the "B" key. If you press "B" below FL180 it will set QFE, if you press "B" at FL180 or above it will set standard pressure.Jim