Question About Dissociative Identity Disorder “Switching”?

I am currently learning about DID and I understand switching is when the alters change but what causes switching? Someone who has multiple personalities how do the other personalities know when to appear? 

If an alter is troublesome and does something bad will the individual know after switching? Or does the memory switches too?

I understand that events can trigger switching but can emotions? Like if an individual is extremely jealous can that bring on an alter? 

Can an alter stay a really long time (without switching). If an individual gets triggered can a specific alter take over them for a long time?

Please excuse my ignorance, I’m only trying to understand this disorder. Thanks in advance.  

Anonymous2021-03-23T00:10:54Z

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THE BANNIBAL ONE2021-03-19T16:18:26Z

It just comes and goes.
There is no switching.

Anonymous2021-03-19T15:03:33Z

It's not real, this does not happen. You sound like you want someone to help you fake it too.