zoomHeight

Zoom to fit the page height to the window.
[read-only property] zoomHeight([out, retval] double *zoom)
When the zoom property is set to this value, the zoom factor is set to fit the current page height to the window.

This property is only useful when setting (or reading) zoom.

VB6:
viewer.zoom = viewer.zoomHeight
zoom
zoomPage
zoomWidth