StackThreads/MP: version 0.77 User's Guide
long st_current_time_ms() @ long st_current_time_us()
respectively. The absolute value does not make sense; the only
difference between two calls do. The resolution depends on the operating
system. Specifically, on Windows NT, the resolution is 10ms, so
st_current_time_us
is no more useful than st_current_time_ms
.