Sending SMS msgs from microcontroller

i'm doing a project which connects a microcontroller to a gsm module.
Most of the code is done but @ the ending part i have to press [CTRL+Z]
to send out the msg but i'm unable 2 do so.

How can i trigger my program so tht wen it runs it triggers CTRL+Z to send out the msg
What makes this a General C++ Programming problem?
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