questions in APP

HI GURU'S

1) why do we give next payment run day in APP can any body explain with examples

2)Suppose if there are 100 open items for payment if i want to block 25-30 items where we can block in F110 , (one r two we can block it but if its huge what to do)

3)how print programe will start in APP

4)if i have 3-4 banks how to/where to assign cheque format for print can you please explain with examples

immediate reply for above will be hightly appreciated

thanks and regards

geetha