[NTG-context] METAFUN's randomized operator's seed

Hi, I noticed that each time I recompile a document using randomized the result is the same, so presumably the random seed is also the same. I guess this is intentional. My questions are: * Does the random seed value depend on a checksum of the tex file or something like this? * How to change it (e.g., to make it depend on the compile time or whatever)? Regards, -- Marcin Borkowski