3 Protocol Details

The Windows Search Protocol message requests require only minimal sequencing. All messages MUST be preceded by an initial CPMConnectIn message (for example, at least one CPMConnectIn for each named pipe connection). Beyond the initial connection there is no other over all sequencing required by the protocol. Some messages do, however, have prerequisite messages that must be sent first. For more information, see the table in section 3.1.5. It is advised that the higher layer adhere to a meaningful message sequence, because the server will respond with an error for messages that are received without the prerequisite message or with invalid data. Note that some messages are also dependent on the higher-layer providing valid data that was received in messages earlier in a sequence.<24>

A typical message sequence for a simple query from a client to a remote computer is illustrated in the following diagram.

Figure 4: Windows Search Protocol session life cycle

The messages represented in the preceding diagram represent a subset of all of the Windows Search Protocol messages used for querying a remote GSS catalog.