appsweb.cfg is an important file for forms configuration. It basically defines the paramater and its values used  by forms.
This file will contain the below information:
Form Server Name,Server Port,Domain Name,Database Connection parameters,Connect mode and JInitiator version.Trace on the forms can be also enabled from appsweb.cfg file.
The same information can also be obtained from context file.

Location of the appsweb.cfg file
$OA_HTML/bin
or 
$COMMON_TOP/html/bin

s_f60webcfg parameter can be checked from context file to find the forms configuration file path.


Below are the some parameter name from appsweb.cfg file and context file to find the details regarding forms.

ContextFileParameter
appsweb.cfg file parameter name
Description
Example Value
s_formshost
serverName
Name of FormsServer
test
s_formsdomain
domainName
Domain name of forms server
mydomain.com
s_frmConnectMode
connectMode
Connecting mode(Socket or Servlet)
socket
s_jinit_ver_comma
jinit_ver_name
Jinitiator Version delimited by ,
1,3,1,18
s_jinit_clsid
jinit_class_id
Jinitiator Class ID
PQRST-0014-0002-0031-ZYXWV