If you're not sure what it does, have a look at
the old thread 
Changes in 0.8 vs 0.7b;
- Increased accuracy
- Optimized the code
- Added progress indicator for the different stages
- Now importing grayscale TIFF (8-bit or 16-bit); IMPORTANT: StarWipe does NOT work on non-debayered/demosaicked images
- Now importing TIFFs with an alpha channel (alpha channel information is ignored)
Get it
here.
Enjoy!