# Join

Joining an already open connection to the SAP server and the SAP GUI window.

<table data-header-hidden><thead><tr><th width="195" valign="top"></th><th width="288.5833740234375" valign="top"></th></tr></thead><tbody><tr><td valign="top">Connection Number</td><td valign="top">[Number] Connection number. Numbering starts from zero.</td></tr><tr><td valign="top">Session Number</td><td valign="top">[Number] Session number. Numbering starts from zero.</td></tr><tr><td valign="top">Window Number</td><td valign="top">[Number] Window number. Numbering starts from zero.</td></tr><tr><td valign="top">Connection Reference</td><td valign="top">[Link] Returns the connection object to SAP.</td></tr><tr><td valign="top">Error Handling Level</td><td valign="top"><p>Select the error handling level. Possible values:</p><ul><li>"Default" - by default;</li><li>"Ignore" - errors are ignored;</li><li>"Handle" - errors are handled.</li></ul><p>If "Default" is selected, the value from the "Start" block of this diagram will be used.</p></td></tr><tr><td valign="top">Message Level</td><td valign="top"><p>Select the message level that the blocks will output during operation. Possible values:</p><ul><li>"Default" - by default;</li><li>"Release" - output is disabled;</li><li>"Debug" - main information output;</li><li>"Detailed" - detailed information output.</li></ul><p>If "Default" is selected, the value from the "Start" block of this diagram will be used.</p></td></tr><tr><td valign="top">Error Text</td><td valign="top">[Text] Returns detailed information about the error in case of incorrect execution of the block's work.</td></tr></tbody></table>