2.2.1.2 Capability Header (CAPABILITY_HEADER)

This is a header that is embedded in the Server Core Capability Request and Client Core Capability Response. The purpose of this header is to describe capabilities for different device types.

CapabilityType (2 bytes): A 16-bit unsigned integer that identifies the type of capability being described. It MUST be set to one of the following values.

Value	Meaning
CAP_GENERAL_TYPE 0x0001	General capability set (GENERAL_CAPS_SET)
CAP_PRINTER_TYPE 0x0002	Print capability set (PRINTER_CAPS_SET)
CAP_PORT_TYPE 0x0003	Port capability set (PORT_CAPS_SET)
CAP_DRIVE_TYPE 0x0004	Drive capability set (DRIVE_CAPS_SET)
CAP_SMARTCARD_TYPE 0x0005	Smart card capability set (SMARTCARD_CAPS_SET)<2>

CapabilityLength (2 bytes): A 16-bit unsigned integer that specifies that size, in bytes, of the capability message, this header included.

Version (4 bytes): A 32-bit unsigned integer that specifies the capability-specific version for the specific value of CapabilityType, as described in the table that follows.

CapabilityType Value	Version Value(s)	Meaning
CAP_GENERAL_TYPE	GENERAL_CAPABILITY_VERSION_01 0x00000001 GENERAL_CAPABILITY_VERSION_02 0x00000002	See section 2.2.2.7.1.
CAP_PRINTER_TYPE	PRINT_CAPABILITY_VERSION_01 0x00000001	Version 1 of printing capabilities.
CAP_PORT_TYPE	PORT_CAPABILITY_VERSION_01 0x00000001	Version 1 of port capabilities.
CAP_DRIVE_TYPE	DRIVE_CAPABILITY_VERSION_01 0x00000001 DRIVE_CAPABILITY_VERSION_02 0x00000002	If the client supports DRIVE_CAPABILITY_VERSION_02, then the drive name of the redirected device can be specified by the DeviceData field of a DEVICE ANNOUNCE header, as specified in the DeviceAnnounce field description of the Client Device List Announce message (section 2.2.3.1).
CAP_SMARTCARD_TYPE	SMARTCARD_CAPABILITY_VERSION_01 0x00000001	Version 1 of smart card capabilities.