Step 1: Understand the question
The question asks whether foreign currency (外汇) possesses the various functions of money within the borders of its issuing country versus within the country where it is considered foreign.

Step 2: Define the functions of money
Money has several key functions: it serves as a medium of exchange, a unit of account, a store of value, and sometimes as a standard of deferred payment.

Step 3: Consider the role of foreign currency in its home country
In its home country, foreign currency (which is actually the domestic currency from the perspective of its home country) performs all the functions of money、It is used for transactions, pricing goods and services, saving, and settling debts.

Step 4: Consider the role of foreign currency in a foreign country
In a country where it is considered foreign, the currency may not be widely accepted as a medium of exchange for everyday transactions, though it might be accepted in certain contexts like tourism or at currency exchange offices、However, it can still serve as a store of value or be used for speculative purposes.

Step 5: Analyze if foreign currency performs monetary functions in the foreign country
While foreign currency can be held as a store of value or used for certain transactions (like buying goods from abroad directly or through black markets), it generally does not serve as a standard unit of account or medium of exchange within the domestic economy of the foreign country, unless it is widely accepted or used in specific sectors.

Step 6: Determine the answer based on the analysis
Given that foreign currency is not typically used for everyday transactions or as a unit of account within a foreign country, it does not fully possess the various functions of money in that context、However, it can still be used for certain purposes like saving or speculative investment.

Step 7: Conclude
Foreign currency does not fully function as money within a foreign country's borders in the same way it does in its country of origin、It may serve some functions like being a store of value but is not typically used as a medium of exchange or unit of account.

The final answer is: $\boxed{否}$