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Applications, systems and methods for permitting simultaneous use of a file by two or more computers over a network may include storing the file locally in a local storage device associated with a local computer; providing access to the file by at least one remote computer which is connectable to th

Applications, systems and methods for permitting simultaneous use of a file by two or more computers over a network may include storing the file locally in a local storage device associated with a local computer; providing access to the file by at least one remote computer which is connectable to the local computer via the network, and wherein at least one of the computers is connectable to the network through a firewall element. The file may be stored in at least one remote storage device associated with the at least one remote computer, respectively, and versions of the file contained on the one or more remote storage devices are synchronized with that on the local device by transmitting over the network connecting the one or more remote storage devices with the local device, at least one of Delta files and Inverse Delta files between the remote storage devices and the local storage device. A method of remotely observing computer activity on a second computer remote with respect to a first computer is also provided. Further, file sharing systems and methods are provided for sharing files among computers.

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1. A method of permitting simultaneous use of a file by two or more computers over a public network, said method comprising: initiating a first firewall compliant connection between a local computer located behind a first firewall element and a public server;storing the file locally in a local stora

1. A method of permitting simultaneous use of a file by two or more computers over a public network, said method comprising: initiating a first firewall compliant connection between a local computer located behind a first firewall element and a public server;storing the file locally in a local storage device associated with the local computer;providing access to the file by a remote computer connectable to the local computer via the public server over the public network, wherein the remote computer is located behind a second firewall element and connected to the public server via a second firewall compliant connection;storing the file in a remote storage device locally associated with the remote computer; andsynchronizing versions of the file contained on the remote storage device with the local device by transmitting over the network at least one of Delta files and Inverse Delta files between the remote storage device and the local storage device, wherein the versions of the file are synchronized and are updated each time a new version of the file is saved at the local computer or remote computer, as long as the local and remote computers are connected in an active subscription. 2. The method of claim 1, wherein connections between the local computer and the remote computer are persistent, the persistent network connections automatically reconnecting broken connections to resume functioning without any requirement for reconfiguration. 3. The method of claim 1, wherein said providing access is predicated at least in part by biodata security requirements. 4. The method of claim 1, wherein the local computer and the remote computer are interconnected securely over a wireless connection without the need to configure the first firewall element or the second firewall element. 5. The method of claim 1, wherein the local computer and the remote computer are interconnected via a VPN. 6. A method of remotely observing computer activity, said method comprising: initiating a first firewall compliant connection between a first computer located behind a first firewall element and a public server that is not located behind the first firewall element;providing access to files stored in a first storage device associated with the first computer to a second computer, wherein information representing the files accessible by the second computer are displayed on the first computer and wherein the first computer and second computer are securely connected, the second computer located behind a second firewall element and connected to the public server via a second firewall compliant connection; andmonitoring access and modification from the first computer of the files accessible by the second computer, the files being manipulated at a location of the second computer, wherein manipulation of a file accessed from the first computer by the second computer can be observed at the location of the first computer. 7. The method of claim 6, wherein the first computer and the second computer are connected over a public network. 8. The method of claim 7, wherein said first computer is connectable to the public network through the first firewall element, the first firewall element configured to protect the first computer from hostile intrusion from the public network, and wherein the second computer is connectable to the public network through a second firewall element, the second firewall element configured to protect the second computer from hostile intrusion from the public network. 9. The method of claim 6, wherein said monitoring is performed in real time. 10. The method of claim 6, further comprising: receiving a log of activities regarding access and modification of the files accessed by the second computer at the first computer. 11. The method of claim 6, further comprising receiving an alert from the second computer at the first computer when a predefined access or modification of a file has been performed at the second computer. 12. A file sharing system for sharing files among computers, said system comprising: means for initiating a first firewall compliant connection between a first computer located behind a first firewall element and a public server;means for storing files to be shared in a first location of a first storage device associated with the first computer; andmeans associated with a second computer for accessing the first location via the public server and first computer and displaying a file structure of the first location on a display of the second computer when the second computer is connected to the first computer over a public network via the public server, wherein the second computer is located behind a second firewall element and connected to the public server via a second firewall compliant connection, wherein files added to the first location are automatically displayed on the second computer display, and wherein a file in the file structure may be executed by selecting said file on the display of the second computer. 13. The system of claim 12, wherein the second computer has full access to and functionality of the files added to the first location. 14. The system of claim 13, further comprising means for storing the files added to the first location in a storage device associated with the second computer, whereby the second computer accesses and modifies the files stored in the storage device associated with the second computer without being actively connected to the first computer over the network. 15. The system of claim 14, further comprising means for automatically updating the files added to the first location upon reconnecting the second computer to the first computer. 16. The system of claim 12, wherein the first firewall element and the second firewall element use different restriction criteria.