You may use a special URL to create and configure connection in Parallels Client for any supported OS:

https://RASHTML5Gateway_Address/URLSchemaRedirector?Command=LaunchApp&&Alias=Alias&Server=Server&Port=Port&ConnMode=ConnMode&Connect=Connect&Save=YES&

User will need to open it in browser, and then Parallels Client will recognize it and will give user a prompt to add a connection.

Example:

If allowed, it will create a new connection in Parallels Client with specified options.

Below you may find full list of available URL Schema variables in version 15.5 and newer:

• Command = "LaunchApp";
• Server = (server IP or FQDN);
• ConnType = "0" (RAS) or "2" (RDP), optional; default value is RAS;
• ConnMode = "0" (Gateway), "1" (Direct), "2" (Gateway SSL), "3" (Direct SSL);
• Port = (port number, e.g. 443);
• Connect = "NO" (do not auto connect on launching URL), "YES";
• Save = "NO" (do not save in the connections list), "YES";
• UserName = (a string, optional, e.g. RASuser);
• EncPass = (encrypted ('hashed') password. If this key will not be set, user will be prompted for password when connecting). Encrypting utility is provided on demand by Parallels Support..
• Alias = (friendly name for a connection, a string, optional, e.g. My_RAS_Connection);
• Backup = (secondary server IP or FQDN, optional);
• AppID = (application ID to launch, useful only if Connect is not "NO". Can be figured out from RAS Console → Publishing);
• To save a connection, set Save to "YES" and Connect to "NO" at the same time.