A selection of ongoing transactions.

Input Format:

A set of one or more of the following:

• phase - A phase-shift motor transaction.
• source - A telescope positioning command.
• channelizer - A channelizer command.
• mark - A mark command. A mark command is assumed to be completed when the first frame that it effects has been written to the archive.

Context:

The acquired command returns an indication of the status of one or more ongoing transactions. The user tells it which transactions to report on via an AcquireTargets argument.