INT 7F - Alloy MW386 - CHANGE NAME OF DOS TASK
        AH = E3h
---v1.x---
        AL = user number
---v2+---
        BH = user number
        BL = task number
---
        DS:DX -> ASCIZ task name
Return: CF set on error (invalid process number)
SeeAlso: AH=E0h,AH=E4h,AH=E5h

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