1) When you perform an ISM (Independent Support Motion) analysis, that 3rd line in the output indicates where the maximum contributing load comes from: (a) the mode (frequency), (b) the load direction), and (c) which support group. The support groups are numbered, but if you have more than 9, the software starts using the alphabet (a, b, c, etc).

2) The only such benchmarks that I'm aware of are the NRC benchmarks. These are available for CAESAR II if you purchase the Verification & Validation Manual. Accompanying the manual is a DVD with the job files (so you don't have to build the model and create the loading input) and verified output. You can run these jobs on your system and compare to the output provided on the DVD.