I had to look it up: SLES = SUSE Linux Enterprise Server
There are a number of packagemanagers for suse: rpm, YasT, apt, ...
RPM -> To check which version linux an rpm is built for use: rpm -qpi <rpm-package-name>
YasT ->
Info @ novell on YasT:
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Updates for SLES are downloaded and installed via YaST Online Update (YOU).
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When using YasT with rpms, YasT will check the dependencies and install only if the rpm is alright for you system. To be absolutely sure: download your rpm's with YasT.
Some more documentation:
http://www.novell.com/documentation/suse.html