bonsai
and for anyone who wants to create their own charting/ techinical indicator thing - good on you - but.....
not sure what u r talking about there about pessimistic - lets call it facts!
and u will lose your connecton for sure on the internet but mostly get logged back in , a lot of the time without u noticiing - does not affect most trading -
but with a data feed from someone like IB, it is just a realtime tick by tick feed - they dont stream data from servers with history back up - so when u connect to their feed - u just get the data in real time from the moment that the you connect and nothing prior - so if u want to trade - u would be using data just from that point - bit hard to do even a one minute 10sma with one tick of data!, and if u lose the connection - you are back at zero when u start up again unless u have databased the prior data - but then u wont have the bit where u were disconnected
and most who start down that route take a while to understand the different data feeds so it is good they get their heads round it before they spend time working on something that aint gonna work
charting suppliers supply real time data combined with historic data, a whole different ball game to a pure tick by tick supplierr - so if they go down, the second u start up again - you are fully up to date with data so are up and running straight away
i have and do run dde connections in visual basic, ( if the supplier does not have an api ) as well as api connections to a number of data suppliers
been a long time since i used dde in excel - but even then it was for analytical work - did not want to reinvent the wheel with charting - u could use it to feed your own charting package - but as i said - the charting comes free with the data - so whats the point
but my point on this subject is that quite often people when they decide to start trading feel they will get an edge by doing their own chariting or come up with their own indicator etc etc - the only way you can learn to trade is to get in there and trade - and once u master trading - then go back and start looking for stuff to make your life easier, such as fully automated trading - but at the start - just get the best tools u can, and find the simplest set ups to make u money