You can the link for Login Page in oracle Apps by fire the below query in sqlplus as apps user :
Query #1 :
SELECT home_url
FROM icx_parameters;
Query #2:
SELECT profile_option_value FROM fnd_profile_option_values WHERE profile_option_id= (SELECT profile_option_id FROM fnd_profile_options WHERE profile_option_name = ‘APPS_FRAMEWORK_AGENT’) AND level_value = 0;
Thank you
Osama Mustafa