[LOOKING FOR] SD-EXT - General description of use

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http://forum.xda-developers.com – Hi, I looked on forum for some summary what is general use of SD-ext partition. So far I found some explanations and some solutions for CM ROMs. So, if I uderstand correctly, I can use sd-ext - either as seamless extension of internal partitions (/data, /system, /cache), for more storage - and/or for installing apps on SD card, that work when SD card is connected to PC ass mass storage Is it right? I am on AOKP ROM, I tried to use it for moving apps with Link2SD and Android Assistent, but they tried to move apps to sdcard. So, what is correct use of sd-ext and how to make it wi (HowTos)