multiple deployments

System

Hi folks,
i'd like to know what's really the interaction between multiple deployments .Let's imagine the following config file


<deployment name="multi" options="transactional" >
<exec-deployment use="intranet_deptInfo" />
<exec-deployment use="intranet_weather" />
<exec-deployment use="internet_careers" />
<exec-deployment use="internet_auction" />
<exec-deployment use="internet_pr" />
<exec-deployment use="internet_book" />
<exec-deployment use="internet_medical" />
<exec-deployment use="internet_periodic" />
<exec-deployment use="internet_yacht" />
<exec-deployment use="teamsite_metadata" />
</deployment>

if internet_yacht fails will teamsite_metadata deployment be done ?

More generally if we have a deployment into database A
and then a deployment B initieted through a script i'd like to know how to rollback A if B fails

many thanks
cheers