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I dont' want to sound totally stupid, although maybe it's unavoidable as I actually am, but what is the net effect of rollovers? if it's a deal that's been done T10 ago, then it's surely irrelevant to today's trades and SP? Or am I missing something?

Anyone wise enough who can set me straight?

Also, how do you rollover a deal? If I've got position open, say a T10, can I ask my broker to roll it over - does that mean I'm asking him to wait another T10 before I settle??

Cheers