Can these be "real" or are they a combination of hallucination, wish fullfillment and fraud.
What you've outlined, as well as Ted's shared experiences, are commonly reported experiences. I can attest to experiences within my own family. Most people do not talk about these things. Two of my children have been visited by deceased relatives and friends, mostly through dreams, and sometimes by 'physical' senses. But, then, both of these children have psychic experiences regularly.
If you read the literature covering OBEs, NDEs, regression therapy, and more, you'll find that an after death communication is merely common, is often part of adjusting to the new reality of NPMR for the departed, often has to do with a sense of unfinished business or a desire to assure those left behind that everything is alright.
As Ted has noted, PMR is a virtual reality, but then all >PMR realities are virtual as well. Tom speaks of being able to manifest a 'physical' presence in other realities, as well. I bring this up to say that switching between VRs is possible, even to the extent that one's presence can be perceived to be as real as anything else existing within the domain of that VR. People often talk of frequencies being a component of perceiving extra-ordinary realities. This is an analogy, of course, but tuning in or out of a radio band is likely a good analog to the phenomena of ghosts, both for those perceiving and for those creating presence. The virtual reality mechanism responds to the intent. (I believe Ted likes to use, Virtual Reality Rendering Engine
[VRRE], a term apparently borrowed from computer science and the graphics rendering processor. It's a good term, even if a bit long.)