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====== Int 21H, AH=5cH ======

===== Input ======

 AH=5cH, AL=Subfunction

^ Subfunction                        ^ Description                                       ^ Version ^
| [[en:docs:dos:api:int21:5c:00|00]] | lock region of file                               | 3.0+    |
| [[en:docs:dos:api:int21:5c:01|01]] | unlock region of file                             | 3.0+    |


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