Hi!
If you are REQUIRED to be the SIC (insurance, ops specs, whatever), you can log SIC the whole time. Cape Air uses SICs, for example, in the Capt's first 100 hours at Cape Air-they legally need an SIC for that time period. You CAN log PIC when you are flying, if you are rated.
HOWEVER, for almost all of your interviewing and applying purposes at other flying organizations, they only want PIC when you are legally responsible for the aircraft and signed the logbook.
If you are a student pilot, no PIC/SIC, even when you are solo.
I am applying for the Japan 767 contract jobs, and you are ONLY allowed to count PIC/SIC (multi-crew or single pilot) time. So, even your INSTRUCTOR time doesn't count towards the 3000 minimums, much less solo or student, or anything else!!!
cliff
GRB