Can Shopify markers auto convert currencies and manage international trading?

[ZS2]

Hi All,

Can you use Shopify Markers to show prices in local currency and auto convert to GBP at Cart  and Checkout/payment stage? 

Can you have just one domain for all international trading?

Can all my  prices be set INCLUSIVE of shipping, duty and Tax?

Is there any limit on number of products or variants for Shopify markers?