transaction demarction

hi, what does it mean by transaction demarcation ?(in EJB)

you see, they are saying "demarcation" ? do they mark something ?
what they mark ? how thye mark ? who marks ?



transactions are unit of statements whcih begins and ends .

i am not sure about they keyword "demarcation".....this is confusing.

can you explain with an example ?

thank you

.

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