why cannot UNION both SELECT and SHOW?

[Konstantin Izmailov <pgfizm@xxxxxxxxx>]

Is it possible instead of executing following two statements:
  SHOW search_path; SELECT version();
to execute just one statement returning both search_path and version?

I'm using Postgres 9.0 and need the result either as two tuples or two fields...

Could you suggest how to rewrite the two statements?

Thx