NXC  Version 1.2.1 r5
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#define MAILBOX1   0

Mailbox number 1

Examples:
ex_joystickexmsg.nxc, ex_joystickmsg.nxc, ex_ReceiveMessage.nxc, ex_ReceiveRemoteBool.nxc, ex_ReceiveRemoteMessageEx.nxc, ex_ReceiveRemoteNumber.nxc, ex_SendMessage.nxc, ex_SendRemoteBool.nxc, ex_SendRemoteNumber.nxc, ex_SendRemoteString.nxc, ex_SendResponseBool.nxc, ex_SendResponseNumber.nxc, ex_SendResponseString.nxc, ex_sysmessageread.nxc, and ex_sysmessagewrite.nxc.