INT 21 - DOS 1+ - SET RANDOM RECORD NUMBER FOR FCBsee File Control Block
	AH = 24h
	DS:DX -> opened FCBsee File Control Block (see #01345)
Notes:	computes the random record number corresponding to the current record
	  number and record size, then stores the result in the FCBsee File Control Block
	normally used when switching from sequential to random access
	not supported by MS Windows 3.0 DOSX.EXE DOS extender
SeeAlso: AH=21h,AH=27h,AH=42h