Int 7F  - Convergent Technologies Clustershare Ctos Access Vector          [N]

   AL = request ID
       01h "Request"/"RequestDirect"
       ES:BX -> pRq
       DX ignored
       04h "Wait"
       ES:BX -> ppMsgRet
       DX = exchange
       05h "AllocExch"
       ES:BX -> pExchRet
       06h "DeAllocExch"
       DX = exchange
       07h "Check"
       ES:BX -> ppMsgRet
       DX = exchange
   CX = 4354h ('CT')

Return: AX = status
       0000h successful