2.2.2.15.1 Text Scale Information PDU (TS_RAIL_ORDER_TEXTSCALEINFO)
The Text Scale Information PDU is sent from the client to the server during the connection establishment phase and when the client system’s text scale factor is changed. The client communicates the new text scale factor to the server by sending this packet. The server uses this information to change the system text size setting. This packet is only sent if the server has advertised support for the Text Scale Information PDU in the HandshakeEx PDU (section 2.2.2.2.3); otherwise, this packet will not be sent.
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Hdr (4 bytes): A TS_RAIL_PDU_HEADER structure (section 2.2.2.1). The orderType field of the header MUST be set to TS_RAIL_ORDER_TEXTSCALEINFO (0x0019).
TextScaleFactor (4 bytes): A 32-bit integer. Indicates the text scale factor ranged between 100 and 225, inclusive.