MgslOpen

Prototype
`ULONG MgslOpen( ULONG PortID, PHANDLE phDevice );`
Parameters
`PortID`	Integer port identifier
`phDevice`	Pointer to buffer to hold returned device handle
Return Value
`ERROR_SUCCESS (0)`	Port successfully opened
`ERROR_DEVICE_IN_USE`	Port is in use by another application
`ERROR_BAD_DEVICE`	Port does not exist or is not functioning

This function opens an HDLC port. If successful, the API returns a handle to the device. Most API calls require an open device handle. The application calls MgslClose when the device is no longer needed. Only one handle per port may be open. This prevents other applications from accessing a port that is currently in use.

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