In particular, concurrency control problems arise when the software, data,and interface are distributed over several computers. Time delays when ex-changing potentially conflicting actions are especially worrisome. ... Ifconcurrency control is not established, people may invoke conflicting ac-tions. As a result, the group may become confused because displays are incon-sistent, and the groupware document corrupted due to events being handledout of order. (p. 207)

eople prefer to know who else is present in a shared space, and they usethis awareness to guide their work

Viewed from a practice perspective, the distinction be­tween cyclic and linear time blurs because it depends on the observer's point of view and moment of observation. In particular cases, simply shifting the observer's vantage point (e.g., from the corporate suite to the factory floor) or changing the period of observation (e.g., from a week to a year) may make either the cyclic or the linear aspect of ongoing practices more salient.

the potential capacity of exterrirorial beings to be everywhere at once and nowhere in particular is inescapably tied to operators that are bounded by their embodied temporal limits of terrestrial existence and sequential information processing. The actual capacity for parallel absorption of knowledge, therefore, is hugely disap­pointing. Equally, the electronic capacity to be now-here and no-where has brought the body to a standstill.