Keys corresponding to ASCII characters are encoded as ASCII
characters. Other keys are encoded with the constants
System dependent. With respect to
MS, the time is specified in
microseconds. How well the OS and the hardware implement this, is
System dependent. On Unix, a lot depends on load. If the system is lightly loaded, and the delay is short enough that Gforth does not get swapped out, the performance should be acceptable. Under MS-DOS and other single-tasking systems, it should be good.