INT 3F - Overlay manager interrupt (Microsoft LINK.EXE, Borland TLINK VROOMM)

Notes:	INT 3F is the default, and may be overridden while linking
	this vector is modified but not restored by Direct Access v4.0, and
	  may be left dangling by other programs written with the same version
	  of compiled BASIC
SeeAlso: INT FE"OVERLAY"