Command
QisLib_SetProcessEvents

QisLib_SetProcessEvents

Function:
	int QisLib_SetProcessEvents(int OnOff);

Inputs:
	On/Off: _QIS_ON (On) or _QIS_OFF (Off)

Return:
	success: 0
	failure: one of the following values :

Errors:
	-1: The program's application context passed to QisLib via QisLib_InitLib is NULL.
	Cannot turn on process events.
	-2: File open in progress, operation not permitted.

Description:
	- While QisLib is busy doing something (e.g. opening a file, drawing, getting vectors,
	saving to a file, etc.), QisLib would need to process any events for the program so
	the program will be responsive to user input.
	e.g. User calling QisLib_Stop during a redraw.
	- If the program does not want QisLib to process events during a busy process, use
	this function to turn it off.
	- Default setting for Windows is on, default for Unix/Linux is on if a XtAppContext is
	passed to QisLib via the QisLib_InitLib function, it is off if XtAppContext is
	NULL.
	- For Unix/Linux, if XtAppContext is NULL, SetProcessEvents cannot be turned on, the
	function would return -1.
	- Otherwise, the state is set and the function returns 0 for success.