interface 318 7.3.1 The guest driver interface 318 7.3.2 Guest application interface 320 7.4 HGCM Service Implementation 321 8 RDP Web Control 322 8.1 RDPWeb features 322 8.2 RDPWeb reference Host-Guest Communication Manager (HGCM) allows a guest application or a guest driver to call a host shared library. The following features of VirtualBox are implemented using HGCM: • Shared Folders • Shared interface The shared library contains a so-called HGCM service. The guest HGCM clients establish connections to the service to call it. When calling a HGCM service the client supplies a function code and

Interface 241 11.3.1 The Guest Driver Interface 241 11.3.2 Guest Application Interface 243 11.4 HGCM Service Implementation 244 2 RDP Web Control 245 12.1 RDPWeb features 245 ## Contents 12.2 RDPWeb Host-Guest Communication Manager (HGCM) allows a guest application or a guest driver to call a host shared library. The following features of VirtualBox are implemented using HGCM: • Shared Folders • Shared interface The shared library contains a so-called HGCM service. The guest HGCM clients establish connections to the service to call it. When calling a HGCM service the client supplies a function code and

241 11.3.2 Guest Application Interface . . . . . . . . . . . . . . . . . . . . . . . . . 243 11.4 HGCM Service Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . 244 12 RDP Web Control Host-Guest Communication Manager (HGCM) allows a guest application or a guest driver to call a host shared library. The following features of VirtualBox are implemented using HGCM: • Shared Folders • Shared Clipboard interface The shared library contains a so called HGCM service. The guest HGCM clients establish connections to the service to call it. When calling a HGCM service the client supplies a function code and

interface 273 7.3.1 The guest driver interface 273 7.3.2 Guest application interface 275 7.4 HGCM Service Implementation 276 ## Contents 8 RDP Web Control 277 8.1 RDPWeb features 277 8.2 RDPWeb Host-Guest Communication Manager (HGCM) allows a guest application or a guest driver to call a host shared library. The following features of VirtualBox are implemented using HGCM: • Shared Folders • Shared interface The shared library contains a so-called HGCM service. The guest HGCM clients establish connections to the service to call it. When calling a HGCM service the client supplies a function code and

288 7.3.1 The guest driver interface ..... 288 7.3.2 Guest application interface ..... 290 7.4 HGCM Service Implementation ..... 291 8 RDP Web Control ..... 292 8.1 RDPWeb features ..... 292 8 Host-Guest Communication Manager (HGCM) allows a guest application or a guest driver to call a host shared library. The following features of VirtualBox are implemented using HGCM: • Shared Folders • Shared interface The shared library contains a so-called HGCM service. The guest HGCM clients establish connections to the service to call it. When calling a HGCM service the client supplies a function code and

288 7.3.1 The guest driver interface ..... 288 7.3.2 Guest application interface ..... 290 7.4 HGCM Service Implementation ..... 291 8 RDP Web Control ..... 292 8.1 RDPWeb features ..... 292 8 Host-Guest Communication Manager (HGCM) allows a guest application or a guest driver to call a host shared library. The following features of VirtualBox are implemented using HGCM: • Shared Folders • Shared interface The shared library contains a so-called HGCM service. The guest HGCM clients establish connections to the service to call it. When calling a HGCM service the client supplies a function code and

interface 318 7.3.1 The guest driver interface 318 7.3.2 Guest application interface 320 7.4 HGCM Service Implementation 321 8 RDP Web Control 322 8.1 RDPWeb features 322 8.2 RDPWeb reference Host-Guest Communication Manager (HGCM) allows a guest application or a guest driver to call a host shared library. The following features of VirtualBox are implemented using HGCM: • Shared Folders • Shared interface The shared library contains a so-called HGCM service. The guest HGCM clients establish connections to the service to call it. When calling a HGCM service the client supplies a function code and

Contents 7.3.1 The guest driver interface ..... 349 7.3.2 Guest application interface ..... 351 7.4 HGCM Service Implementation ..... 352 8 RDP Web Control ..... 353 8.1 RDPWeb features ..... 353 8 Host-Guest Communication Manager (HGCM) allows a guest application or a guest driver to call a host shared library. The following features of VirtualBox are implemented using HGCM: • Shared Folders • Shared interface The shared library contains a so-called HGCM service. The guest HGCM clients establish connections to the service to call it. When calling a HGCM service the client supplies a function code and

Contents 9.3.1 The guest driver interface ..... 486 9.3.2 Guest application interface ..... 488 9.4 HGCM Service Implementation ..... 489 10 RDP Web Control ..... 490 10.1 RDPWeb features ..... 490 IDisplay::notifyHiDPIOutputPolicyChange([in] boolean fUnscaledHiDPI) ## fUnscaledHiDPI Notify OpenGL HGCM host service about HiDPI monitor scaling policy change. #### 6.44.13 notifyScaleFactorChange void u32ScaleFactorHMultiplied) ## screenId u32ScaleFactorWMultiplied ## u32ScaleFactorHMultiplied Notify OpenGL HGCM host service about graphics content scaling factor change. #### 6.44.14 queryFramebuffer IFramebuffer

375 7.3.1 The guest driver interface ..... 375 7.3.2 Guest application interface ..... 377 7.4 HGCM Service Implementation ..... 378 8 RDP Web Control ..... 379 8.1 RDPWeb features ..... 379 8 IDisplay::notifyHiDPIOutputPolicyChange([in] boolean fUnscaledHiDPI) ## fUnscaledHiDPI Notify OpenGL HGCM host service about HiDPI monitor scaling policy change. #### 5.16.9 notifyScaleFactorChange void u32ScaleFactorHMultiplied) screenId u32ScaleFactorWMultiplied ## u32ScaleFactorHMultiplied Notify OpenGL HGCM host service about graphics content scaling factor change. #### 5.16.10 queryFramebuffer IFramebuffer