You can always go thru the BIS guide fore more information on these services…at a high level these services help more on when running html template or .template UI for example if you want the email body to show up as a html based UI (similarly to the IS .dsp pages)
pub.report:runTemplateOnPipe (input $template as emailTemplate.html and $package (the current package where the html template resides (normally any custom templates are stored in the package/pub folder)
HTH,
RMG
#Integration-Server-and-ESB#webMethods