Hello, I'd like to get started with PostScript. I'm completely new to it and would be very grateful to you for any hints. And my first question is (please don't ridicule me): how do I make a PostScript file? I mean, a plain text file with PostScript code, produced by hand. I read some chapters of a few tutorials and learned basics of the language's syntax, but didn't find anything on how to run it. First, do I have to make .ps the file's extension? Second, do I need (or when do I need) the %! command at the beginning of the file? And finally, what to do to make the computer execute the program?