This structure is used in fn 4b03H (load an overlay).

Offset Size Contents
+0      2  wStartSeg    segment to load the overlay (at offset 0)
+2      2  wReloFactor  Relocation factor
4               length of an ExecOverlayRec

wStartSeg  The segment address at which to load the overlay.  This memory
must be owned by the caller.

wReloFactor  The factor to be added to each segment reference on the load
module during segment fixup.  For .EXE-format overlays, this
is normally the same as wStartSeg.  For .COM files (binary
images that need no fixups), this should be 0.

- -

Load Overlay Record (ExecOverlayRec)