Givinging access to 2 different Domains

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?
ahmad1467Asked:
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DrDave242Senior Support EngineerCommented:
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
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ahmad1467Author Commented:
Ok I will take a look at this but the two domains are in two different forest.
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DrDave242Senior Support EngineerCommented:
In that case, you can either create a forest trust to link the two forests together or an external trust to only link the domains.  The link I sent has information about creating either type.
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