BioMart is a simple and robust data integration system for large scale  data querying.

On this example I use the bioconductor package "biomaRt" to look for SNPs.

There are two examples with in the protocol.

The first one looks for SNPS on a particular gene

The second takes a list of values (same component as above) to retrieve a list of SNPs for a chromosomal region.

You need to have biomaRt package installed on your system. This post "Install Bioconductor Package" helps you with the installation.

Your result will look like:

This example need server access to the Biomart repository. If you are behind a firewall that blocks your call, please let me know, there are more ways to reach Biomart.

Hope this helps.

Pedro