Hello,I am realizing that the Baron and 747 gauges are increasinly the best way to learn about XML gauge programming. I came across this in the ECU gauge for the baron and am curious about the "b" I see in the value section: (A:general eng1 throttle lever position,part) (A:Throttle lower limit,part) /-/ + b 1 + /What is that "b"?Thanks,J-

"b" is a backspace operator.It jumps the last stack entry and pop the beforelast, but WITHOUT poping (removing) the last. Examples:2 4 5 b = gives 4 and jumps 5 stack 2 4 5 + b = gives 5 and jumps + operator2 4 + 5 b = gives 6 jumps 53 5 b b = gives 5 and jumps the b operator 3 5 b b b = gives 3 and jumps the 54 5 7 b (>LVar1) (>LVar2) now LVar1 equals 5 and LVar2 equals 7 Tom

Thanks Tom.Is that documented somewhere and I missed it? I have the SDK stuff, Arne's stuff and the FS2X.com stuff for documentation.J-

It is not documented that I know. And BTW I find it rather confusing. I prefer to use other operators like "r" (though not the same meaning), registers (s,l) etc. Tom

Re: "confusing" couldn't concur more. What a "black art" this all is. However, I am forcing myself to make a panel using XML gauge scripting as a way to learn it better. This is the year I stop "lurking" as an add-on guy and start getting my hands dirty. I've found FSDS v3 a good inspiration as something about gMax wouldn't stick with me. As I've dabbled with modeling, I've also decided to try my luck with XML gauge stuff. So far, I have an OAT gauge (WHOOOOPEEEE!!!).Thanks for the help,J-

In your first example, what's the state of the stack after calling the operator b?

"b" examples:2 4 5 b = stack is 2 4 5 4 2 4 5 + b = stack is 2 9 5 2 4 + 5 b = stack is 6 5 6 Tom