definitely, yes
no, as long as you have a passport
No, a South African citizen does not need a visa to visit Dublin or anywhere else in Ireland. If you are travelling via the UK (even in transit) I think that you now need a visa. (Not for Ireland but for the UK.) Worth checking out prior to travel just to be sure!
Spanish passport holders are required visa for entering Vientam.
You need a passport and an entry visa if you are entering Mexico from any country other then the US.
Right. Even on connecting flights, you need a visa when entering US soil.
Myanmar passport holders are required visa for entering Vietnam.
Yes, you still need a Visa because you are entering an entirely new country. The options however, depend on your citizenship.
You would need a visa to visit the United Kingdom in order to go to Belfast.
Dublin has 3 universities: * Trinity College Dublin * University College Dublin * Dublin City University In addition Dublin has many other colleges. It depends on what you want to study. Depending on where you are coming from, you may need a study visa. Check with your local authorities.
Depends on where you are from. But most passport holders (With the exception of European Union countries) need to get a visa before entering Britain.
No one will ever need to check their Visa status because checking it isn't relevant to anything important.