Understanding XY Processing Priorities.

[SkyFrontier]

When creating several files like in

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::$a = readfile(<curitem>); copytext $a; writeFile("z_MergedText.txt", "<crlf><crlf>$a<crlf><crlf>-SEPARATOR-", a, tu); focus; sendkeys'{down}'; focus a; sendkeys"{enter}";

,
do I need to 1) provide some sort of safety-belt via "WAIT" command or 2) will XY
-writefile
-wait until writefile finishes file creation
-THEN executing next commands?
Is there a way/switch to enforce XY waiting to execute next command, in case of a negative for the situation #2?
Thanks!