how are package versions resolved

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• how are package versions resolved
• Multiple versions within a single package [solved]
• [SOLVED] Multiple versions within a single package...
• [RESOLVED]!!! Multiple versions within a single package slot
• make.conf, package.use, package.keywords are [solved]
• [solved] Both versions of PHP
• switching versions [SOLVED]
• [Resolved]latest versions
• Where Are Older Versions? (Solved)
• (SOLVED)Is there a difference between the dolphin versions?
• multiple versions in same slot [solved]
• ghostscript versions not matching SOLVED
• ffmpeg 2 versions in conflict [SOLVED]
• [Solved] Multiple versions of strigi
• [solved] older versions of Wine?
• [SOLVED] How can I get rid of postgresql versions < 8.3
• sys-fs/cloop: all (both) versions fail [solved]
• Banshee alone needs multiple versions of faad2? [solved]
• Issues unmerging old versions of php [SOLVED]
• SOLVED -- this a record? - 5 months trying, 3 versions of Pclos and still can't