Internet Direct (Indy) Version 9.0.2 Beta
TIdSysLogMessage.Hostname
This property is the name or IP address of the computer sending the message.

property Hostname: string;
Description
This property is the name or IP address of the computer sending the message. By default, this is set the IP address of the user's computer and is obtained by using GStack.LocalAddress.

Note: This property is not stored in the DFM because the HostName property is specific to a user's computers and storing it in the form files could create a wrong value in the System log.