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Actually most file securing software gets information about extactly where on the disk to find the files and overwrite the file data with different data, sometimes they do it many times to weaken previous magnetic resonance which can remain on the disk.... you can just opent he file, overwrite the entire contents (file needs to be at least the same length) and repeat the process a few times than call delete on the file, but a professional program would also rename the file a few times as well, this helps to make the filename unrecoverable too.... actually this type of thing is seemingly really easy to do...
If you wanted to get really advanced you would find a way of completely removing the file pointer in the file table by safely over writing it such that others can not even begin to speculate as to where on the disk the file could have been... this is much more complex though and you could damage your file system if you do it incorrectly.
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