Yes, sure, but bear in mind that the second user has to pay separately for all the market data subscriptions it needs.
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Given that both TWS and Gateway are pretty stable, it¡¯s likely that there would only be a few minutes per day (during the daily reset period, where nothing much is happening in the markets anyway) that this could provide any benefit, and it probably won¡¯t be needed then anyway, so I doubt whether it would be worth the additional costs involved.
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My philosophy has always been that things will inevitably happen that prevent you trading for one reason or another, and it¡¯s better to just accept that and deal with the issue manually on a case-by-case basis rather than try to program round them in some way. This philosophy makes it imperative to ensure that you always have a suitable stop-loss in place when you have an open position. I would say that it really doesn¡¯t matter if you miss a trading opportunity occasionally: the markets will still be there tomorrow¡
