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how to set path?

Hi, I'd like to know how to set path in IDL. For example, my idl program is
in some directory. In the program, some datafile will be input. If I donot
set whole path including the directory, there is a falt indicating that the
data file cannot be found in rsi\idl. I hope that all the file in the same
directory as idl program will not indict whole path. How to do that? thanks!