Couple of questions hopefuly someone on here can answer.

1-When you place a lay bet at SP, is a certain amount of your bank put to one side for that bet, or is the money only taken from your account once the market closes, and SP is determined.

Example, lets say I want to lay all my selections for 5% liability of my bank, but I have 30 selections (so only enough for 20 selections to start with) for the day, can I do it all at once, or would I have to wait till some had resulted during the day to place the SP lay bets on the remaining 10 selections?

2-Can you set a upper and lower limit on your selections?

I know a bot will do all that I am asking, but dont have my selections done until after scratchings by which stage I'm at work. Unless anyone knows of a Iphone bot app?