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This is not to be offensive, just to make the point where to invest time: 4.22 is more than enough for scalping. If there is a problem it might come from another point (software?).

1. Yes, every platform adds huge overhead. If they offer an internal language like C# this is far from generating machine executable code. 2. This ("not reinvent the wheel") is a linguistic image that is frequently used to attract people to high level platforms. Writing code for...

+1 Please note that the article is total junk and was already classified as a hoax back in 2005. Just one of the many links that explain it: http://xrlq.com/2005/01/31/unemployed-german-prostitutes/

1. This is very slow. If an ATS is written in some proper programming language (like C#, C++, Java, VB) a not too sophisticated strategy would need only some microseconds to process a tick with modern CPUs. (Not milliseconds like in the Ami example) 2. Not necessarily. My first answer was...

Probably most used approach: - create a new object (consumer or whatever you choose to call it) for every symbol tracked - let the objects work independently - react to every new tick received immediately This usually isn't time critical if coded properly (with modern CPU power). I...

1) Yes 2) There are different approaches, you need to know which was chosen by your provider. For information about the possible approaches: www.tradingrecipes.com/files/cntcontr.pdf http://www.premiumdata.net/support/...scontinuous.php...

Au contraire: Small lots can be traded at high precision (pricewise) only by algos not by humans (too slow). Big lots is indicative of true dinosaurs trading like pension funds (or sometimes an algo catching a chance).

To me it looks like we might stare into a bottomless pit. Can't see a stop of the downturn yet.

If that (license cost) is the main reason there may be workarounds. May I ask which (charting) software shall be used? In my view it makes sense to think about assigning different computers to different tasks. For example if some of the screens should be used for following news, mail...

You sure? For the moment I see that we'll go down. But then (if nothing has changed in the general market dynamics) we'd have to test the region around 5850 at least once (before we go down bigtime which certainly will come because the bottom isn't solid).

True bottom not yet seen. (Though I do not know whether the turning point was seen already at 5590, might even go up to something like 5650 before turning down.)

Apparently quite some people are getting nervous. I received several unsolicited mails from brokers that assure that nothing like this could happen with them. (Obviously they lost already a number of clients.)

Maxim that I'd strongly recommend: Store any data that you get. If you don't sometimes you will deeply regret it. (We all come up with new ideas all the time. If we stored years of data and something could be there but wasn't stored it makes us feel miserable. Have seen this with...

Mainly it is just noise without substance. Not only relating to US but in general. Surely Greece is toast (spent too much, insufficient GDP). But the other countries (Portugal, Ireland, Spain, Italy, France) are quite healthy. In some aspects GB or US show much worse numbers (debt)...

Simple method that works for codebases of up to several MB (perhaps 100-200 code snippets max, even more if you are very disciplined): Store all the code snippets in one single textfile. Put tags in front of the snippets that describe it. When snippet needed: Search for appropriate tags...

First congrats that you reach b/e. Many people always enter into the wrong direction and never have a chance to reach b/e. The old "never let a winner turn into a looser" seems good advice to me. What you describe is what happens to me all the time. The markets are very competitive...

For me DAX looks like triple top. Also the bottom was not convincing for me. I wouldn't be too astonished if a big downward move would again test the lows. Still holding two cars from 6027. Either I'll be stopped out at entry or will follow all the way down.

Short @ 6027, expect good downward move.

No comment needed. Form speaks for content and state of mind of poster.

What gave you this impression? IB level 2 is not aggregate (if you mean levels are summed). What do you mean "all the order books"? IB limits their users to subscribing to order books for only 3 symbols per account.