I need 2 explanations:

 
In FOREX, if it properly does not exist sessions with beginning and ending time, how the opening, maximum, minimum and closes prices are determined?,


Some indicators/Oscilator are structured in function of sessions/periods (for example. MACD is 26-12-9). If the time Chart context is one hour, it means that 26-12-9 must be understood like 26 hours -, 12 hours, 9 Hours?
 
ATAHUALPACL:
In FOREX, if it properly does not exist sessions with beginning and ending time, how the opening, maximum, minimum and closes prices are determined?,


Some indicators/Oscilator are structured in function of sessions/periods (for example. MACD is 26-12-9). If the time Chart context is one hour, it means that 26-12-9 must be understood like 26 hours -, 12 hours, 9 Hours?