hi there.
though i'm jst into my 2nd yr of MBA (HR),i'l try to share few things dat i hope wilb useful for u.
core hr is specialization in evry aspect of HR,ie,recruitment, training and development, succession planning, performance management, compensation mngmnt, industrial relations, trade union managemnt.....studyng all the hr topics in detail.
in small IT co.,HR work is mainly limited to recruitment,if u want to make a career in hr,though IT co.will give you high salaried but if u want to gain knowledge,start with some manufacturing industries.
cheers
amrita