Refrigerator compressor

In a refrigerator's compressor there are three pipes. Can anyone tell me what each pipe is for? here is a pic of a compressor.
http://www.applianceblog.com/archives/2005/07/refrigerator_co.html there's one in the lower left, lower right and upper right.
It's just that in a car's A/C compressor, there are only two....one inlet and one outlet.
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In, out, process.
The "process" tube is used to charge the refrigerant after the assembly is complete, then pinched off and brazed. Cheap but effective.
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