explain this : how do i know that im typing this question to someone ? and not that im imagining it ? i could be

Question: explain this : how do i know that im typing this question to someone ? and not that im imagining it ? i could be dreaming right now ? so therefore i can do whateveer i like . i am myself . ?
- Keywords:
  dream,
  imagine,
  real
Asked by alanyabirdywordy to David, Luna, Mark, Melanie, Probash on 24 Mar 2011 in Categories: General.
- David Pyle answered on 24 Mar 2011:
  
  You don’t. But I have received the question and am replying. So either we are all in the same ‘imaginarium’ or this is real..

Question: explain this : how do i know that im typing this question to someone ? and not that im imagining it ? i could be dreaming right now ? so therefore i can do whateveer i like . i am myself . ?