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Int 21 Fn 58 - DOS 5+ - Get Or Set Umb Link State [D]
AH = 58h
AL = subfunction
02h get UMB link state
Return: AL = 00h UMBs not part of DOS memory chain
= 01h UMBs in DOS memory chain
03h set UMB link state
BX = 0000h remove UMBs from DOS memory chain
= 0001h add UMBs to DOS memory chain
Return: CF clear if successful
CF set on error
AX = error code (01h) (see AH=59h)
Note: a program which changes the UMB link state should restore it before
terminating
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