Clarification sought on checkpoint 10.1

Checkpoint 10.1 states
'Until user agents allow users to turn off spawned
windows, do not cause pop-ups or other windows to
appear and do not change the current window without
informing the user.'

looking for clarification on the second part 'do not
change the current window without informing the user.'

Can someone tell me what this means please

Cheers
Graham Oliver 

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Received on Tuesday, 29 May 2001 23:22:30 UTC