Whya are there .so.2, .so.4 and .so.0?

[tj]

I am condused, really a normal state for me :-). I have a slackware 
install and it has libssl.so.0, but some apps require libssl.so.2 or 
libssl.so.4. I go to www.openssl.org and find that 0.9.7m is the latest 
release.

Where are the .2 and .4 major numbers  coming from and what 
distinquishes them from one another? I am trying to build h323 apps and 
getting all sorts of  "library not found errors" concerning .so.2 and .so.4.

tj
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