[Genome] About Affy All Exon

[Li, Dong]

Dear Sir,

Good morning. I have some questions about UCSC Table Browser's Affymetrix All Exon data.
http://www.genome.ucsc.edu/cgi-bin/hgTables?hgsid=98882974&clade=vertebrate&org=Human&db=hg18&hgta_group=regulation&hgta_track=yaleBertoneTars&hgta_table=0&hgta_regionType=range&position=chr9%3A21957875-21965084&hgta_outputType=primaryTable&hgta_outFileName= 

After download data, I find if I specific GeneExpression and Regulation" selection in group and specific "Affy All Exon" in track. The data give us contain ChromStart ChromEnd expids expScores and so on. But I wonder sine the expScore value was got from different probe, how I can find specific probe location information from this data? I mean I only have general range information from ChromStart ChromEnd and in theory, every block should contain several probes.
So how I can find the probe location information?.

Second, if every expScore value comes from correspond group probe's signals, how this signal come out? I mean just simple give every probe average value and sum them or have to give specific handle?

Thanks in advance and I look forward to hearing from you ASAP.

Dong Li Ph.D.