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Hello Peter! I'm still working on the MCP. There are some problems. I transfer data to PMDG 737NGX by FSUIPC. And the offset is 3110. 3110: Operates a facility to send any ‘controls’ to Flight simulator. This works with all versions of FS & CFS. Write all 8 bytes for controls which use a value (axes and all _SET controls), but just 4 will do for ‘button’ types. This is really two 32-bit integers. The first contains the Control number (normally 65536 upwards), as seen in my FS Controls lists. The second integer is used for the parameter, such as the scaled axis value, where this is appropriate. Always write all 8 bytes in one IPC block if a parameter is used, as FSUIPC will fire the control when you write to 3110. Since version 3.40, FSUIPC-added controls (other than the offset ones) can be used via these offsets too. See the Advanced User’s Guide for a current list. And I found the SDK about 737NGX. There are two ways to send MCP data. Texts in PMDG_NGX_SDK.h #define THIRD_PARTY_EVENT_ID_MIN 0x00011000 // equals to 69632 #define EVT_MCP_COURSE_SELECTOR_L (THIRD_PARTY_EVENT_ID_MIN + 376) //this is the first one #define EVT_MCP_CRS_L_SET (THIRD_PARTY_EVENT_ID_MIN + 14500) // Sets MCP course specified by the event parameter the second one Problem is I can add numbers to the MCP course selector But I can not minus it. My program is (VB.net) Dim senderfs As Offset(Of Int64) = New FSUIPC.Offset(Of Int64)(&H3110) senderfs.Value = &HFFFFFFFF00000000 + &H11000 + 376 FSUIPCConnection.Process() How can I minus or tranfer value directly to 737 ?