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checking for presence of files

 Hi all. I know the answer to this could be system-dependent. I work
with Mathematica 4.0 on unix workstations.

 I wonder if it is possible to define a function that checks if a file
exists in your disk, something like

 FindFile[filename_String] = True if the file exists, False otherwise.

 Any ideas would be appreciated. Otto Linsuain. 

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