MsgBox ? "how to insure that it is on same monitor as"

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If I've assigned the name of the listbox to the variable 'listBoxSysTitle', would this be correct?

MES m.hwndowner=F"{listBoxSysTitle}"
m.style=F"{MSGforHotKey_StyleButtons}n"
m.x=175 ;;160329 from 10
m.y=400
m.timeout=15
m.default='C'
int i=mes("" ""m)