Create Alias Descriptor

Call With

AX = 000AH
BX = selector

Returns

if function successful
Carry flag = clear
AX = data selector (alias)

if function unsuccessful
Carry flag = set
AX = error code

8011H	descriptor unavailable
8022H	invalid selector

Notes

• The selector supplied to the function may be either a data selector or an executable selector. Note that the published 0.9 specification was in error to say that the function generates an error on a data descriptor.

• The descriptor alias returned by this function will not track changes to the original descriptor. In other words, if an alias is created with this function, and the base or limit of the original segment is then changed, the two descriptors will no longer map the same memory.

• Refer to the rules for descriptor usage in Appendix D.