You can access Jim Dandy's MQL4 youtube course here for free. He also has a website with videos here and here. These are my notes of lesson 3:
extern variable and functions
- string variable -> can be used as label for settings -> EA Settings
- F4 Terminal <-> Editor
- any external number can be seen through the functions; variables in functions can only be used within that function once
- extern variables are not constantly changing
- variables in functions like indicators are constantly changing
- functions can communicate over extern variables like "extern int opentrades"
void function
- not an information request
- just does something
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