Nowhere as much as on the dining table is the Swedish formality, especially in the toast. Never touch the cup first; you must wait until one of the hosts, usually the man, raises his glass to everyone. Do not drink. Everyone must respond to the uttered "skål" (which means "happy" and is pronounced skol) with a collective "skål." So you all tip your glasses to the host and hostess. Prolonged eye contact is imperative before, during and after the measured sip to appreciate the liquor. Do not empty the glass. The meal has started.
From here or over dinner, talking will still play a role, but the procedure is individualized and personal. The guests talk to each other. You are free to toast anyone except the hostess. She can toast with whoever she wants. It is an insurance to prevent the hostess from getting drunk. Of course, it is tempting for everyone to toast her as a thank you.
The roots of this tradition related to alcohol could be found with the Vikings. They always lived in danger, and no one was to be trusted. The rule was to toast a "friend" looking directly into each other's eyes and with one arm behind the back to avoid a quick throat slit. Today you can buy wine and spirits only in government places, called Systembolagett. Caution is part of Swedish nature, and alcohol rituals prove it.
Coming back to the table, most of the rules will be somewhat familiar to you, they are simply practiced in a more accentuated way. We leave you with your Swedish hosts now. You can surely find your way from here on. As a foreigner you are granted a certain freedom of action in strict respect of customs. But whatever you do, don't take the bottle when you leave. After this transgression there is certainly no possible redress.