help:label tape question

[fenglimian]

Hi all,
   I have a 3494 library with two dirve,the backup-archive server with ADSM .When the 
library must label 200 tapes a time,at the same time ADSM must have backup some 
date,can these two operations be doing at the same time?
   Another question is if I take the opertion:
ADSM>label libvol libname search=yes labelsouce=barcode
can library auto label all those tapes in the library?
   Last can you tell me what's the "scratch pool" ?
Thanks and regards
Feng