# CVPORT System Variable [GstarCAD 2027](Help%20System/GSTARCAD/2027/Index.md) → [System Variables](Help%20System/GSTARCAD/2027/System%20Variables/(System%20Variables).md) **Function Description:** The CVPORT system variable is used to change the identification code in the current viewport. | | | | --- | --- | | Type | Integer | | Saved in | Drawing | | Initial value | 2 | **System Variable Value:** Users can change current viewport by setting the CVPORT system variable, first they should meet the following conditions: 1. The specified identification code should be one active viewport code. 2. The cursor has not been locked and it can move to viewport when executing a command. 3. The Tablet mode has turned off. --- [Original help](https://www.gstarcad.net/help/GstarCAD_2027_en-US/detail/systemVariables/CVPORT.html) · © Gstarsoft Co., Ltd.