olemus
sidetehnoloogia haru,
võimaldab võrgus saada
kohaloluteavet

ülevaateid
https://www.collab9.com/services/presence/

https://www.sangoma.com/articles/presence-technology/

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.638.7927&rep=rep1&type=pdf

https://www.thedigitaltransformationpeople.com/channels/cyber-security/physical-presence-technology-a-complete-explanation/