You can run fireworks (cmsShow) on your laptop or desktop machine and access data directly from our Tier-2 dCache.
Just put the prefix 'root://dcache-00.rcac.purdue.edu/pnfs/rcac.purdue.edu/data/' in front of the LFN.
To copy a single file from the Tier-2 dCache to your local machine (laptop or desktop) you can use the command xrdcp.
First you need to initialize your ROOT or CMSSW environment (run cmsenv).
You will get a progress bar as the file downloads. You may also want to think about using the -R option, which allows you to recursively download a directory.
Please see the details at https://silicondetector.org/display/xrd/xrdcp
If you are using ROOT, you can open files from our Tier-2 dCache just like you would any other file:
This returns a TFile object, and you can proceed normally.