[1.7.10] [Solved] Accessing another mod's classes without setting a dependency?

[Awesome_Spider]

I would like to know if it is possible to access another mod's classes and code without setting a dependency.  Basically what I want to do is if the mod is installed I want to be able to access it's code but if it's not installed to not do anything with it. I don't want to make an addon, I just want to basically call some methods in another mod if it is installed if that make sense.

[jabelar]

Note also that depending what you want to do, some of the mod content may be available through things like the registries. For example, if you wanted to spawn a mob from another mod I think you just have to check if it is registered then spawn it.

[Awesome_Spider]

Thanks, I'll mess around with it.