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| rule type | process-start | ||||
| Related Syntax | Related Concepts | ||||
Syntax
  process-start condition?
     action*
A rule to be performed before all other processing.
A process-start has several special stream-related properties. Streams opened in process-start rules without specifying the domain-free open modifier can be written to by:
Similarly, process-start rules can write to streams opened with the domain-free open modifier, or to any stream opened in:
Changing groups in a process-start rule has the following effects:
Of course, changing groups never affects a subsequent rule if it is done within an action preceded by a using group as prefix.
Changing groups can affect a process-start rule as follows:
| Related Syntax domain-free process process-end using group | Related Concepts Initialization and termination rules: universal | 
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