gw/gw_disconnect is a SAP Parameter attribute which is used to control Timeout to cancel inactive gateway connections information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
This parameter specifies the time period after which an inactive gateway
connection is to be closed. Connections that have been created to other
gateways are normally kept open until the other gateway is closed.
If there are no active connections to this gateway and the time frame
has expired, the connection to this gateway is closed.
Value 0 deactivates this check.
This check can be performed a maximum of every
See SAP Parameter Documentation for full SAP documentation for this profile parameter.