INT 7F - Alloy MW386 - GET TASK NAME FROM PROCESS NUMBER
        AH = E4h
---v1.x---
        AL = user number
---v2+---
        BH = user number
        BL = task number
---
        ES:DI -> buffer for task name
Return: CF clear if successful
            CL = memory size (00h=128K, 01h=256K, 02h=384K, 03h=512K, 04h=640K)
            DX = task flags
                bit 7: MSDOS process
            ES:DI buffer filled
        CF set on error (invalid process number)
SeeAlso: AH=E5h