No, it just picks the first one it can found. To run multiple masternodes you have to split you funds to multiple wallets or to use start-many command.
ok. Thanks again for the very informative replies.
I think I'll go and google a few cryptocurrency terms such as "unspent output". I imagine this to be something that's not an explicit representation of the wallet address but that contains the wallet address implicitly or something like that, so it is the equivalent of checking that the wallet has the 1000 DRK.
Trouble is I haven't got enough understanding of basic crypto technical concepts - like signing and stuff. I imagine signing to be something like taking a transaction and then MD5 hashing it or something. Where can I read up on all this basic stuff ?
Many thanks again for the tips. 2 more masternodes coming online when I'm done ! A consequence of 'buying the dip' when DRK was down at 0.003. (Well one of them is anyway).
Every time you receive funds in your wallet you get an output of the transaction into your wallet. You can see your outputs in coin control in your wallet (in the send tab, I believe you have to activate it in settings because it is turned off by default... I can't check now). Sometimes you'll have several outputs in the same address because it was used for several payments you received. When you send a payment the wallet selects one or several outputs and takes the funds from there. You can do this manually if you use coin control. They become the inputs of the new transaction. If the amount is not exact, you'll get a new output with the change when you send that payment. The unspent outputs are those you still have in your wallet. You can check your unspent outputs in coin control, or in the console with the command 'listunspent', or in the blockchain explorer.
For example, check this transaction:
http://explorer.darkcoin.io/tx/1480d81fb88b8e0d2754feca70e2f0a4a905eedd757498bc1a3101a27d68fa76#o0You can see that output with index 0 has already been spent and you check the transaction in which it was spent (in which it is the input):
http://explorer.darkcoin.io/tx/81c9818d336f7dfb4fc11fa10344207f5477313901ea70fccbaf6628c4f72967#i0Output with index 1 is still unspent ('Not yet redeemed')... at least for now.
Edit - forgot to add why this is relevant for masternodes
When you send funds from your mastenode wallet you can't use the 1000 DRK unspent output or the masternode will stop working. Let's say you have unspent outputs of 1000, 1, 1, 1, 1.5, 1 and 2.5. If you want to send 5 DRK to someone, you need to use coin control to be sure that you use some of the smaller unspent outputs as inputs in the transaction, not the big one. If you used the 1000 DRK one, you would get back a 995 DRK output as change. The balance in the wallet would be higher than 1000 DRK, but you would not have a working masternode.