Accessing Android remotely

Hi,

I would like to access an android device, say A, from my android tablet and windows PC with two scenarios.
Please help me in this regards.

· Which is the best app for accessing an android device, say A, from my android tablet and windows desktop PC?
· Without using any apps in an android device, say A, how to access it from my android tablet and my desktop PC?

Please assist me for all above concerns.

Regards
Ugn10

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