The Summary page displays general information about the minidump, plus a list of all possible streams and data about streams that are present.
For each stream that is listed we indicate if the stream is present, the RVA (the offset from the start of the minidump) to the stream and the size of the stream.
If you want to see the complete command line (for the cases when it's too long to display) use the Copy button to copy the command line to the clipboard.
To display the command line the minidump must contain Thread Info and memory data. The Thread Info is used to locate the Thread Environment Block, which is then used to locate the Process Environment Block, which is then used to read the command line.