I have a number of sites running off the same Drupal installation (multi-site). I just installed a new module and would like to enable it for all sites.

Is there a method for doing this without going to each sites 'admin/modules page' and manually clicking the checkbox and submitting the form?

I can't find any documentation on how to do this and my feable attempt at module_invoke('event','install') doesn't work becuase the module isn't enabled. I've also looked at the system.module that creates the admin/modules form. I can copy the appropriate code out of there to do it, but figured there might be a cleaner way....

Anyone got any ideas? Thanks in advance.