!!! Overview[1]
[LDAP] is an inherently [asynchronous protocol|Asynchronous Operation], meaning that, in most cases, you can issue multiple concurrent requests over the same connection and the client will be able to correlate the responses with their appropriate requests.

Most of the [JAVA LDAP SDKs] and other LDAP API function calls have both [{$pagename}] and [Asynchronous Operation] versions.

A [{$pagename}] [LDAP Request] call must return and provide a [LDAP Result Code] before your client can continue executing code.

This is in contrast to [Asynchronous Operations] which return a [Message ID] and __NOT__ a [LDAP Result Code].

[{$pagename}] function calls, are typically identified by an -s or _s suffix in the function name. (In "c" SDKs)

[{$pagename}] can be used when an application using the LDAP does not need to perform [Asynchronous Operations], and if it does not attempt to process multiple operations on the same connection at the same time, then you can use the [{$pagename}].

[{$pagename}] may achieve a significant increase in throughput and reduction in response time. In our testing, we have generally seen a performance improvement of about 15-20% by enabling the option to use [{$pagename}].

You should __always__ use [{$pagename}]s when using [LDAP Connection Pools] for reasons as stated above.

%%warning
The [LDAP] protocol specification ([RFC 4511] section 4.2.1) states that [bind operations|Bind Request] cannot be processed on a connection that has any other outstanding operations. 
%%

!! [Bind Request] and [Bind Response] must be [{$pagename}]
In particular "Before processing a [Bind Request], all uncompleted operations MUST either complete or be [abandoned|Abandon Request]" and "After sending a [Bind Request], clients __MUST NOT__ send further [LDAP] [PDUs] until receiving the [Bind Response]." 

This is because a bind operation is used to change the authentication state of a connection (and in some cases may also include negotiating a communication security layer). It is dangerous to have other types of operations in progress on the connection while a [Bind Request] is being processed because the bind processing may change the nature of the response to the client.

!! More Information
There might be more information for this subject on one of the following:
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* [#1] - [Authenticate LDAP users in asynchronous mode with UnboundID LDAP SDK|https://sourceforge.net/p/ldap-sdk/discussion/1001257/thread/f7f00ed1/#3768/|target='_blank'] - based on information obtained 2016-02-28-