They will not be able to access our database correct?

This will be for our vendors to post leads directly into our system.

Enterprise WSDL
A strongly typed WSDL for customers who want to build an integration with their salesforce.com organization only.

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Partner WSDL
A loosely typed WSDL for customers, partners, and ISVs who are building client applications for multiple organizations. It can be used to access data within any organization.

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Apex WSDL
Click on the link below to download an Apex programming WSDL.

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Metadata WSDL
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Delegated Authentication WSDL
Click on the link below to generate and download a Delegated Authentication WSDL file that can be used for any organization.

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Client Certificate
Click on the link below to download an SSL client certificate for validating requests generated by salesforce.com.

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I am trying to move away from using names to check for duplicates in salesforce when importing through the import wizard. I would like to check for dupes by matching phones in the system.  How can I set this up?

I am trying to post this into salesforce if possible.

I will need leads generated by a provider posted into salesforce in real time. I would like this lead to screen pop, or be quickly available to another call center. When the call is transferred they should have instant access to the lead in SFC.  This should be as quick and seamless as possible.  The person posting the leads is not my company and does not currently have access to salesforce.  

Can we post leads into salesforce that are EDI or Raw 271 data?  Can salesforce work with this type of data? What needs to be done in order to do this?

I am working with a lead provider to get him to be able to post leads directly into SalesForce.  (either http or XML).  He is asking me to get the field names as they show in salesforce coding.  I think this is API?  I downloaded the APex explorer but am unsure what to do at this point. I tried to login but it said I needed a security token.  Please help.

This will be for our vendors to post leads directly into our system.

Enterprise WSDL
A strongly typed WSDL for customers who want to build an integration with their salesforce.com organization only.

Generate Enterprise WSDL

Partner WSDL
A loosely typed WSDL for customers, partners, and ISVs who are building client applications for multiple organizations. It can be used to access data within any organization.

Generate Partner WSDL

Apex WSDL
Click on the link below to download an Apex programming WSDL.

Generate Apex WSDL

Metadata WSDL
Click on the link below to download a Metadata WSDL file.

Generate Metadata WSDL

Delegated Authentication WSDL
Click on the link below to generate and download a Delegated Authentication WSDL file that can be used for any organization.

Download Delegated Authentication WSDL

Client Certificate
Click on the link below to download an SSL client certificate for validating requests generated by salesforce.com.

Generate Client Certificate

I will need leads generated by a provider posted into salesforce in real time. I would like this lead to screen pop, or be quickly available to another call center. When the call is transferred they should have instant access to the lead in SFC.  This should be as quick and seamless as possible.  The person posting the leads is not my company and does not currently have access to salesforce.  

I am working with a lead provider to get him to be able to post leads directly into SalesForce.  (either http or XML).  He is asking me to get the field names as they show in salesforce coding.  I think this is API?  I downloaded the APex explorer but am unsure what to do at this point. I tried to login but it said I needed a security token.  Please help.