NAME
    SetProgramDir -- Sets the directory returned by GetProgramDir (V36)

SYNOPSIS
    oldlock = SetProgramDir(lock)
    D0                       D1

    BPTR SetProgramDir(BPTR)

FUNCTION
    Sets a shared lock on the directory the program was loaded from.
    This can be used for a program to find data files, etc, that are
    stored with the program, or to find the program file itself.  NULL
    is a valid input.  This can be accessed via GetProgramDir() or
    by using paths relative to PROGDIR:.

INPUTS
    lock - A lock on the directory the current program was loaded from

RESULT
    oldlock - The previous ProgramDir.

SEE ALSO
    GetProgramDir(), Open()

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