Can a Module Call Drush to Perform Command-Line Operations?

Hey,

I'm looking to write a module that can, essentially, create new drupal subdomains sites - which would require creating a new directory inside of /sites/ - as well as some other filesystem & db functions. Since modules can only write inside their sites files directory, I was wondering if drush could be called by a module to perform these types of operations? If not, do you have any suggestions?

Thanks