I emailed a professor, saying I'm looking for a position. I introduced myself and wrote about experiences that I thought would be relevant to his work. I read on his website that he was recruiting students in a few research fields, and I cited the two in which I was interested, and said I would like to know more about them. After 20 minutes I received this: "welcome". What does that even mean? Should I take it as a simple "no"? How do I reply to this? I'm interested in his work, but there are also other professors in this school with similar areas of research. Should I move on to them without replying to this professor?
EDIT: I did ask for clarification. I asked if I could look forward to a position in his group, and he replied with "yes, you can". However, I find it kind of strange because he didn't ask for any additional information or give any instruction. I don't know what I can make of this. Any suggestions on how I can proceed?