To open the help file with VS2005 you need to create a shortcut with this target:
C:\Program Files\Common Files\Microsoft Shared\Help 8\dexplore.exe" /helpcol ms-help://TKH.ScheduledTaskAdapter/ScheduledTaskHelpFile/home.htm
You need to add the adapter, in the Biztalk Admin Console, open the Platform Settings -> Adapters
Then New -> Adapter, give it a name e.g. "Schedule" and select Schedule from the drop down.
The adapter is added to the default host instance, you may like to change this.
Create a schema in your project for the trigger message. Make it simple just a root node and a namespace. Generate an instance of this schema
Add a receive port and receive location – select transport type of Schedule -> Configure
Select the schedule property ellipsis and set the schedule to Timespan 5 minutes
Select the task property ellipsis and select XmlStringStreamProivider -> paste the generated instance of the trigger message.
OK…
Select XmlReceive Pipeline
In your orchestration set the activate receive shape to receive a trigger message and bind this the orchestration receive port to the receive port just created.