.TH VCMAILBOX 1 . .SH NAME vcmailbox \- send messages to the VideoCore via the mailbox . . .SH SYNOPSIS .SY vcmailbox .RI [ word0 ] .RI [ word1 ] \|.\|.\|. . . .SH DESCRIPTION .B vcmailbox is a low-level utility for sending mailbox messages to the VideoCore. See .B [MAILBOX] or .BR vcmailbox (7) for more information on the available messages and their respective formats. and .BR raspiotp (7) for some examples of typical usage. . . .SH SEE ALSO .BR vcgencmd (1), .BR raspiotp (7), .B [MAILBOX] . . .SH REFERENCES .TP .B [MAILBOX] https://github.com/raspberrypi/firmware/wiki/Mailbox-property-interface