DPP and LR

No this is not a "which is better" question. I ahve both and have been using LR the most recently but have been going back to DPP a little. The question is if I use DPP to PP certain things (sharpening, luminance curve, exposure comp) and save it will/should it be relfected in LR? I just tried it and it doesn't seem to but I am wondering if that is because the potos were already imported to LR.

I no LR doesn't actually alter the pic file, does DPP act in the same way?

No you will not see the changes. DPP cannot read Lightroom's changes (even if using sidecar .xmp files) and LR cannot read DPP's changes, it will just ignore them.

DPP writes the changes to the actual RAW file instead of using sidecars or the database like Lightroom does. However, the changes written to the RAW files in DPP are only metadata instructions like LR (no change to actual picture information.) That is why in DPP you can save your changes, but later revert to original without harming image quality.

- Side note:
In LR (with write to .xmp turned on) it will write the metadata directly into .dng and .jpg files in much the same manner as DPP does with .cr2 files. That is because .dng and .jpg are well documented formats, whereas the .cr2 is proprietary, and potentially dangerous to write to.

Thanks

So the only way to have any PP done in one show done in the other is to convert the RAW file to JPEG or TIFF correct.

That is correct.