user resource

From The x3270 Wiki
Type Default Option: -user
string false x3270 c3270 wc3270 s3270 b3270

Specifies the user name sent in response to a TELNET NEW-ENVIRON sub-negotiation request.

The default is the value of the USER environment variable, if defined, otherwise the value of the USERNAME environment variable. If neither is defined, the default is UNKNOWN.