NAME
    GetProgramDir -- Returns a lock on the directory the program was loaded
                     from (V36)

SYNOPSIS
    lock = GetProgramDir()
    D0

    BPTR GetProgramDir(void)

FUNCTION
    Returns 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 returns are
    valid, and may occur, for example, when running a program from the
    resident list.  You should NOT unlock the lock.

RESULT
    lock - A lock on the directory the current program was loaded from,
           or NULL if loaded from resident list, etc.

BUGS
    Should return a lock for things loaded via resident.  Perhaps should
    return currentdir if NULL.

SEE ALSO
    SetProgramDir(), Open()