xprocess - part of Simula to Xlib interface
IOProcess class XProcess;
Used as superclass of user defined controllers for XWindow
INIT: Should be registered with ProcessManger and attached
Sequencing: (NextEvent)* - called from sub-classes only.
ref(XBasicEvent) procedure NextEvent;
This operation makes the process wait until an event is
avialable. When this happens it returns with an object
representing the X-event that happened to the XWindow this
process is controlling.