Opening multiple powerpoint files, using 2003

[daverskully]

A friend of mine just converted to office 2003, using powerpoint. He said that with the previous version he was using (2000), he could open multiple powerpoint documents at once, each in its own powerpoint application. He said that once he converted over to powerpoint 2003, this no longer worked and he could only open one file. The benefit of the previous capability of having 2 opened at once was that he makes a great deal of powerpoint presentations on a consistent basis and he could easily see the differences in the two powerpoint files. Is there anyway to open 2 powerpoint applications at the same time with 2003?