Dream walking is a type of path working exercise. In path working a person enters a calm and relaxed state of mind. If you were hooked up to an EEG machine ideally you'd be measuring theta brain waves. While in this meditative state a person basically just uses visualization to travel within their own psyche. This is particularly useful for helping people with amnesia or other memory or brain injury problems not associated with dementia. Path working is basically a precursor to hypnosis.
Dreaming walking is similar. Basically its the same thing as path working only you are using your dreams. Again helpful for people with amnesia etc etc. In spiritual models dream walking can mean to actually travel a seperate spirit world through one's dreams in order to interact with spirits and gods.
What you are asking about is shared dreaming. Something that is not as scientifically founded but still interesting to experiment. This is the idea that two or more minds can enter a state of sleep and meet within the same dream environment and interact with each other as though they were in the real world.
Shared dreams that are highly lucid (as in the people involved ALL have awareness as if they were in the real word) are very hard to do. I think I've only had a hand full of successful shared and lucid dreaming attempts and all lasted only a few minutes or less. Shared dreaming that is not lucid, just a regular dream state is a bit easier to do. But the catch is that there is no garuntee that the people you try it with wouldn't end up being Freddy Kruger instead of yourself.
Basicly to attempt to share a dream with another person all you have to do is agree to go to sleep at the same time- doesn't matter if its the same place and that you have some sort of mechanism to tell your brain to dream about your partner. A picture under your pillow is one way or you may have something personal of theirs. A ring, neckless, favorite toy or doll. This item or items is called an anchor. Its meant to make the mind focus on that thing or person and manifest them into your dreams. Even something in writting can work too. So to actually attempt a shared dream all you do is agree on a place to meet in your dreams, some place familar (library, local pub, night club, your house etc etc) just some place that you and your partner(s) are comfortable and familar with. Then before you go to sleep you and your partner tell yourselves to dream about the other(s). And place what you are using for an anchor either under your pillow or under your bed or right above your head. By place it towards the head you are telling your brain to be aware of it and it'll increase the chance of it working.
Simple enough aye? It will take a while before it is successful but if you practice at least several times a week you will start to dream about the other person and visa versa. But how you interact with them and what you see and experience in a non-lucid state is purely for your subconscious minds to figure out themselves and will most likely not match up 100%.
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