4.4 Vendor Id

  It is often necessary to detect the version of the server so that
  bugs can be worked around. This extension allows the client to do
  so. (It may also be sent by the client using an EXTENDED request.)

	 string "vendor-id"
	 string vendor-structure
	 string vendor-name
	 string product-name
	 string product-version
	 uint64 product-build-number
  vendor-name
     Arbitrary name identifying the maker of the product.

  product-name
     Arbitrary name identifying the product.
  product-name
     Arbitrary string identifying the version of the product.

   product-build-number
     A build-number for the product, such that if a bug is fixed in
     build-number 'x', it can be assumed that (barring regression in
     the product) it is fixed in all build-numbers < 'x'.