@UNIQUE

@UNIQUE[d:\path]:  Creates a zero-length file with a unique name in the 
specified directory, and returns the full name and path.  If no path is 
specified, the file will be created in the current directory.  The file 
name will be FAT-compatible (8 character name and 3-character extension) 
regardless of whether the file is created on a FAT or HPFS drive.  This 
function allows you to create a temporary file without overwriting an 
existing file.