I am running Galaxy locally and it has been performing flawlessly! I wanted to get more insight about this flag in the FASTQ Quality Trimmer program:

Maximum number of bases to exclude from the window during aggregation

  Does it mean the number of 5' bases to exclude while the doing the trimming step [i.e. the sliding window starts this many bp after the read start] ? I would really appreciate if someone could shed more light on this. Thanks.