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Setup:
Please do not try the writing to the cdb, it is disabled and it's not needed - your job ends when you have created the file and read it back
The calibration files will be written and read to the local directory (./)
TestCDBTTree.C creates a small CDBTTree object and writes it to test.root
TestCDBHistos.C creates a few histograms and writes them to test.root
Do not mix CDBTTree and CDBHistos, you can only save only one or the other (likely, have't tried that)
TestCDBRead.C reads the file back from the cdb trying different time stamps. The limited validity range does not work yet