Turn your back for a second and BAM the thread goes up to 4 pages!
Why all manufacturers can't agree on a standard naming scheme for VLANs is beyond me. Cisco in particular seem to have their own names for everything.
The labeling of ports as Tagged, Untagged or Excluded is confusing. It is basically describing what action the switch will take to traffic leaving that port.
The section of network between the firewall and the switch that carries all the vlan tagged traffic from several vlans is known as a vlan trunk. Though I think that could be Cisco's naming it's pretty much universal!
Traffic within the switch, on a particular VLAN, destined for the firewall must exit onto the trunk connection and remain tagged. Hence that port is labeled Tagged.
Traffic within the switch, on a particular VLAN, destined for a client computer must exit from one of the ports with clients connected and have vlan tagging removed. Hence those ports are labeled Untagged.
All the ports which are neither a trunk connection nor an exit port for that particular vlan are labeled Excluded.
I hope that makes some sort of sense to you.
If your goal here was to get some VLAN experience then I think you're right on target! ;)
Steve