Access another mac different network

[Harv213]

Hi, I have a web design client who needs a bit of help with training after making the site live. He lives a fair distance from me. Whats the best way to allow me access and control while he is logged in to run through wordpress? Only thing is he is on Snow Leopard (older imac) and I am running Mojave. Any help would be appreciated, apologies if it's on the wrong forum area.

 

[techwarrior]

Teamviewer if he can find an older version that is compatible with Snow Leopard.