A very helpfull feature which is needed very ofter is to allow online data to
pass to a build activation.
we need this when activating a script that suppose to receive parameters and use
them inside his work. The value of this param is diffrent in each invocation.

For example: deploying an archive artifact that hudson holds to a specific
server (Test,Qa,Prod) , this deployment script needs first of all the target
server to deploy to + several other parameters (user,password etc..) ,it would
be nice to trigger a build (by url or form) and to pass all the arguments
relevant to the deploy process.
For ex: HUDSON_URL/job/MyBuildJob/build?serverName=QA;password=XXX
and to read the serverName and password values on runtime