Here is the descriptions for all the pev_ constants. I don't recall seeing an equivalent for EngFunc_ constants but I've seen them used quite a bit so you can search for them on the forums and in existing plugins (look at plugins that might do things similar to what you are trying to do). Another place to look is in
fakemet_util.inc which is a bunch of examples of using some of these.
However, if you can do something without fakemeta, you should generally use that method. E.g. if you can do it with fun.inc or cstrike.inc or dod.inc, you should prefer that method first unless it isn't actually doing what you want.
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