ESearch Entrez Utility
part of the NCBI Eutils tools

ESearch
Try this:
http://eutils.ncbi.nlm.nih.gov/entrez/eutils/esearch.fcgi?db=pubmed&term=great+day&retmax=10&retstart=100
where:
db   = pubmed (database to search for)
term = words(s) to search, use '+' instead of space
retStart = x  (x= sequential number of the first record retrieved - default=0 which will retrieve the first record)
retMax   = y  (y= number of items retrieved. Maximum allowed 10,000)
A detailed description of the ESearch interface is available at http://eutils.ncbi.nlm.nih.gov/corehtml/query/static/esearch_help.html

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Dr Jaime Prilusky, course@weizmann.ac.il.