Alerts, Triggering checks, several questions

Hello. I'm just trying out the product, which looks quite good. I have a few questions.

Is it possible to set a timeframe for when you don't accept alerts, for example, Not to receive alerts in the middle of the night?

Is it possible to manually trigger a check of a monitored system?

How often are monitored systems checked?

Is it possible to change a monitored system's settings without having to log into the system, for example, is it possible to change the settings of a monitored system from the pulseway.com dashboard?

Thanks for any help.