Normally, this is only valid for window or child window components.
If no caption is present, or the component does not support captions, the
engine should return "<SAFS_NULL>".
The Android Engine also persists these values as SAFS variables.
An object reference or proxy reference to the component.
A reference to a particular component previously returned from
a call to getTopLevelWindows, getMatchingParentObject,
or one of the other engine commands that return such references.
Examples:
E, GetCaption, TheComponentReference
Get the Caption of the TheComponentReference.
Returns the String caption or "<SAFS_NULL>" if no caption was available.