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You need to create a trust between the two domains in order for accounts in one to be given rights/permissions in the other. &nbsp;Here's a starting point for creating trusts, but the specific procedure depends on several factors, such as whether the two domains are in the same forest or not:<br />
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<a href="http://technet.microsoft.com/en-us/library/cc794775%28v=ws.10%29.aspx" rel="ugc">http://technet.microsoft.com/en-us/library/cc794775%28v=ws.10%29.aspx</a>
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You need to create a trust between the two domains in order for accounts in one to be given rights/permissions in the other.  Here's a starting point for creating trusts, but the specific procedure depends on several factors, such as whether the two domains are in the same forest or not:

http://technet.microsoft.com/en-us/library/cc794775%28v=ws.10%29.aspx [http://technet.microsoft.com/en-us/library/cc794775%28v=ws.10%29.aspx]

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Ok I will take a look at this but the two domains are in two different forest.
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Ok I will take a look at this but the two domains are in two different forest.

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I currently have 2 different domains Domain1 and Domain2<br />
I am trying to run program from a PC as a user in domain 1, the program is trying to connect to another application that is located on a server that is in domain 2, is there a way I could give permissions to this user in domain1 access to domain2? I am able to create mapping to directories in domain2 by mapping the drive as a user in domain2 but it seems different to when trying to run a program?
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I currently have 2 different domains Domain1 and Domain2
I am trying to run program from a PC as a user in domain 1, the program is trying to connect to another application that is located on a server that is in domain 2, is there a way I could give permissions to this user in domain1 access to domain2? I am able to create mapping to directories in domain2 by mapping the drive as a user in domain2 but it seems different to when trying to run a program?

Givinging access to 2 different Domains

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.

Active Directory

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.