yes, of course I am concerned
unfortunately, i am between a rock and a hard place ... of course i am in a unique situation (and not recommended) but, either i use the sw or i DON'T trade. also, i freely admit i am a bad discretionary trader, so the sw helps me in that area as well.
if TWS goes down, which it has occasionally, it automatically reconnects to the PB program (as long as it stays up), so the worst that has happened to me so far is a few minutes of disconnect time. each time this has happened, it has not cost me any money. Of course there is always the possibility that something dies .. choose 1 :
a) computer
b) router
c) modem
d) phone line
e) ISP
f) stock market
g) TWS
h) act of God
i) etc.
there is no way to protect against everything. I do the following :
a) 2 computers with duplicate software connect via router
b) DSL Line with triple backup 56k modems
c) two ISP's
d) limiting my expected risk to less than 0.5 percent of any trade
e) trading both long and short roughly equally
f) limiting amount invested (all trades) to about 25 percent of total capital available
(i also trade as many as 20 positions simultaneously ... a number which i hope to increase greatly in the future)
the worst case scenario I see is :
the stock market crashes on a day when my computer or IB's system goes down completely.
were this to happen, I would expect not to be able to connect at all. with (e) above I would have huge gains in some positions, huge losses in others, but should still be ok. should I be mostly long i this situation I would expect I could be out as much as 15%. I would still survive and be able to continue trading. should I be short of course, it would be a much nicer scenario
the only other way to protect oneself, would be, once an order is filled, to place a panic stop order, which is cancelled and replaced with a normal market order (automatically by the sw) when I want to close a position. I am thinking of implementing this, but for now i am trading such small amounts that I feel comfortable that (e) above should protect me ok.
M