>>Sergey's answered your questions with API ways, but the volume label can also be retrieved using the ADIR() function by passing 'V' as one of the attributes.
>
>Can you give an example using this ?
>I haven't found any documentation about V attribute.
>
>I also tried those but no volume serial was returned.
>

>? ADIR(v,'c:','DV')
>DISPLAY MEMORY LIKE v
>? ADIR(v,'c:\','DV')
>DISPLAY MEMORY LIKE v
>? ADIR(v,'c:\*.*','DV')
>DISPLAY MEMORY LIKE v
>? ADIR(v,'c:\*.*','V')
>DISPLAY MEMORY LIKE v
>

As George stated in his message, it returns a Volume Label not a serial number.