In Dissociative Identity Disorder (DID), formerly known as Multiple Personality Disorder (MPD), the alternate personalities or alters are distinct identities that exist within the same individual. These alters can have their own unique traits, memories, emotions, and perceptions. Each alter may have its own name, age, gender, personal history, and even physical characteristics.
In some cases of DID, there can be varying degrees of communication or awareness between the different alters. Some alters may be fully aware of the existence of the others and may have access to their memories, while others may have limited awareness or no awareness of the other alters.
The "host" is the term used to refer to the individual's original identity, which is usually the identity that is present most of the time and carries the individual's given name. The host may or may not be aware of the presence of the alters initially, and the level of communication and memory sharing between the host and alters can vary from case to case.
It is important to note that DID is a complex and often controversial disorder, and our understanding of it is still evolving. The experience of DID can be different for each individual affected, and there is ongoing research to better understand the nature of this condition. If you or someone you know is struggling with issues related to identity, memory, or dissociation, it's important to seek professional help from a qualified mental health professional experienced in working with trauma and dissociative disorders.