[galaxy-user] How can I tell what programs are used by a tool?

Hi all -- I'd like to know what programs are used when I run a tool on my data. Ideally I'd also like to know what parameters are passed to command line tools. For example, I uploaded a sam file to the main galaxy server at PSU. I ran Filter Indels. I got output. What programs were used in this manipulation? samtools mpileup? GATK? FASTX toolkit? I hope I'm missing something extremely obvious. Thanks for your help. Holly