How do you return more than one variable in a plpgsql function?

I have never figured out how to make a plpgsql function return more than 
one variable or type. I read something where a function an return an 
open cursor, but I never figured out how. I want a function to be able 
to return an entire row of a table or a number of fields from different 
tables using plpgsql.

How can I do that?
Thanks!
Mark