How to display the sub-form of another program and click the button inside?

is like this, I want to do an automated software, want to call a button in his sub-form, can not find the idea, for example, notepadPP, how to use other programs to display his Preference interface, and click to modify Language to chinese?

Nov.19,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3a7a5-2c225.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3a7a5-2c225.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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