Question about External Variables

Hi,

Are the external variables initialized only in the beginning, or are they reinitialized on every tick?

Let's say I set the lot size to 1 as an external variable and attach the EA.

Then when I right click on the chart and select EA properties and change the lot size after it has been running, will it affect the lot size that the EA uses?

extern int Lotsize will be initialized at initial runtime only.

Thank you!