how to configure apacheDS Ldap with the appian? In general any Ldap with Appian.

@sathya and @eric, i have few general interest questions :
As we have two authentication-provider in spring-securuty-03-....xml file
1) appianAuthenticationProvider
2)ldapAuthenticationProvider

suppose say i have user X in LDAP but not in appian and now i am trying to login to appian using X credentials
is User X will have permission to log into the system? or
is it compulsory that we need to sync this user into our appian?
Where search will happend first in appian or LDAP?

Suppose we have multiple LDAP server then we need use a space between each LDAP server, such as: value="ldap://serverA:389/DC=abc,DC=uk ldap://serverB:389/DC=abc" in this case
my assumption is diffrent ldap are on diffrent machine. am i right?
if yes then how we will provide diffrent userDn and Password.

@sathya and @eric, i have few general interest questions :
As we have two authentication-provider in spring-securuty-03-....xml file
1) appianAuthenticationProvider
2)ldapAuthenticationProvider

suppose say i have user X in LDAP but not in appian and now i am trying to login to appian using X credentials
is User X will have permission to log into the system? or
is it compulsory that we need to sync this user into our appian?
Where search will happend first in appian or LDAP?

Suppose we have multiple LDAP server then we need use a space between each LDAP server, such as: value="ldap://serverA:389/DC=abc,DC=uk ldap://serverB:389/DC=abc" in this case
my assumption is diffrent ldap are on diffrent machine. am i right?
if yes then how we will provide diffrent userDn and Password.