The vows of poverty are various and diverse by order and whether they are simple or solemn, and so the vocations director for each institute would likely be the best to answer how it applies within their institute. Some generalities may be noted however.
In general, a vow of poverty is a renunciation of worldly goods in order to follow Christ all the better. Basically, one vowed to poverty may not acquire, possess, use, or dispose of personal property except as his superior dictates. Therefore, when we think of evangelical poverty, we are thinking of something quite different from the destitution or pauperism we often think of when we think of poverty.
While the religious himself can possess little to nothing, though, often the order or monastery itself has a significant holding. For example, all the monasteries and convents I’ve visited have been country estates set on a large plot of land. The books are aplenty, the rooms, both private and common, are simply yet tastefully furnished and warm in winter, the food of good quality and well-prepared, the health of the religious well cared for, a small fleet of cars present for necessary transport. Except in certain orders, the life is not so austere as one would think.
Certainly many orders use computers for business, communications, and research purposes, but I would likely not think that many would allow a brother a computer just for the purposes of recreation. Likewise television, which is likely completely unnecessary. I’d think that such passive entertainment is likely contrary not simply to evangelical poverty, but much that a religious would stand for.