>>How do you obtain the position of an object in relation to the full screen? OBJTOCLIENT( ) returns a position or dimension of a control or object relative to its form, and perhaps you can go up the chain of parents all the way to the full screen?
>
>Take a look at Pixels and Foxels for some pointers.

Apparent solution, FWIW:

The overall objective is to determine the position of the mouse cursor, in pixels, relative to the top/left of a browser object.

With the help of an answer by Cetin ( Message # 576288 ) we can determine the position of the mouse in pixels relative to the top left of the screen, so the task becomes calculating the position of the top-left of the browser object relative to the screen. Then we can calculate the desired offsets.

The original calculations didn't quite jibe with what I saw, so I fudged the top and left by 4 as shown below and then it seems to work. Don't know the justification of the fours, but maybe not by concidence _VFP.Top and _VFP.Left are -4 when the window is maximized.

MouseY_RelativeToWindow = Calculated by Cetin's method
MouseX_RelativeToWindow = Calculated by Cetin's method

loBrowser	  = Thisform.pgfMain.page5.oMapcontainer.oBrowser
lnBrowserTop  = _SCREEN.Top  + Thisform.Top  + OBJTOCLIENT(loBrowser,1) + SYSMETRIC(9) + 4
lnBrowserLeft = _SCREEN.Left + Thisform.Left + OBJTOCLIENT(loBrowser,2) + SYSMETRIC(10) + 4

MouseY_RelativeToBrowserObject = MouseY_RelativeToWindow - lnBrowserTop
MouseX_RelativeToBrowserObject = MouseX_RelativeToWindow - lnBrowserLeft

Addition: Seems I will need to add a new fudge factor because the item shown has its own offset, but that is another matter.

Alex