| Op-Code: | PXENV_UNDI_CLOSE |
| Input: | ES:DI points to a t_PXENV_UNDI_CLOSE parameter. |
| Output: | PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE will be returned in AX, with the CF set accordingly. The status field in the parameter structure will be set to one of the values represented by the PXENV_STATUS_xxx constants. |
| Description: | This call disconnects the network adapter from the network. Packets cannot be transmitted or received until the network adapter is open again. |