Newbie CRM questions

Newbie CRM questions

Hi I 'm Mark and I'm the guinepig for a sales force of 100 financial advisors.

I've signed up for the free trail for three users which I hope to use for myself, my appontment maker and my secretary.

Can all three of uss access, add and edit the same database from three different PC's or iPads/iPhones at the same time?

Will I need extra user names and passwords?

TIA

Mark