Getting the state of reviewers/participants via JSON API?

Greetings,

Through almost no help of the docs, I discovered that I can elide the clientGuid and provide active: true and I get the review summary.

Essentially:

{ command: "ReviewService.getReviewSummary", args: { clientBuild: 9200, reviewId: 900101, active: true } }

will return the useful information.

I only found this out because I sent: 

{ command: "ReviewService.getReviewSummary", args: { blah: "fake" } }

and the error message listed the known entities, one of which was 'active'.  I guessed at the client build, just throwing a number in there that was related to Code Collaborator at one point.  I don't know if it's relevant, but it doesn't work without it.  The documentation is misleading, unfortunately.

--  Morgan