programms work flow

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This is written in the dictionery: Scripts and expert work in their own flow. Custom indicators work in the interface flow.

Can anybody explain them?
does " their own flow" means flows coded in the program?
then what does the interface flow mean?

thnx a million in advance!!

[Slava]

Sorry, wrong translation. Should be "in their own threads".
Thanx for note.
Interface thread (interface flow) is main application thread.